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topology
     1. n. (mathematics) A branch of mathematics studying those properties of a geometric figure or solid that are not changed by stretching, bending and similar homeomorphisms.
     2. n. (mathematics) A collection τ of subsets of a set X such that the empty set and X are both members of τ and τ is closed under finitary intersections and arbitrary unions.
     3. n. (medicine) The anatomical structure of part of the body.
     4. n. (computing) The arrangement of nodes in a communications network.
     5. n. (technology) The properties of a particular technological embodiment that are not affected by differences in the physical layout or form of its application.
     6. n. (topography) The topographical study of geographic locations or given places in relation to their history.
     7. n. (dated) The art of, or method for, assisting the memory by associating the thing or subject to be remembered with some place.
having
     1. v. present participle of have
     2. n. Something owned; possession; goods; estate.
     have
                Additional archaic forms are second-person singular present tense hast, third-person singular present tense hath, present participle haveing, and second-person singular past tense hadst.
          1. v. To possess, own, hold.
                I have a house and a car.
                Look what I have here — a frog I found on the street!
          2. v. To be related in some way to (with the object identifying the relationship).
                I have two sisters.
                I have a lot of work to do.
          3. v. To partake of a particular substance (especially a food or drink) or action.
                I have breakfast at six o'clock.
                Can I have a look at that?
                I'm going to have some pizza and a beer right now.
          4. v. To be scheduled to attend or participate in.
                What class do you have right now? I have English.
                Fred won't be able to come to the party; he has a meeting that day.
          5. v. (auxiliary verb, taking a past participle) (Used in forming the perfect aspect and the past perfect aspect.)
                I have already eaten today.
                I had already eaten.
          6. v. (auxiliary verb, taking a to-infinitive) See have to.
                I have to go.
          7. v. To give birth to.
                The couple always wanted to have children.
                My wife is having the baby right now!
                My mother had me when she was 25.
          8. v. To engage in sexual intercourse with.
                He's always bragging about how many women he's had.
          9. v. To accept as a romantic partner.
                Despite my protestations of love, she would not have me.
          10. v. (transitive with bare infinitive) To cause to, by a command, request or invitation.
                They had me feed their dog while they were out of town.
          11. v. (transitive with adjective or adjective-phrase complement) To cause to be.
                He had him arrested for trespassing.
                The lecture's ending had the entire audience in tears.
          12. v. (transitive with bare infinitive) To be affected by an occurrence. (Used in supplying a topic that is not a verb argument.)
                The hospital had several patients contract pneumonia last week.
                I've had three people today tell me my hair looks nice.
          13. v. (transitive with adjective or adjective-phrase complement) To depict as being.
                Their stories differed; he said he'd been at work when the incident occurred, but her statement had him at home that entire evening.
          14. v. (Used as interrogative auxiliary verb with a following pronoun to form tag questions. (For further discussion, see "Usage notes" below.))
                We haven't eaten dinner yet, have we?
                Your wife hasn't been reading that nonsense, has she?
                (UK usage) He has some money, hasn't he?
          15. v. (UK, slang) To defeat in a fight; take.
                I could have him!
                I'm gonna have you!
          16. v. (dated) To be able to speak a language.
                I have no German.
          17. v. To feel or be (especially painfully) aware of.
                Dan certainly has arms today, probably from scraping paint off four columns the day before.
          18. v. To be afflicted with, suffer from.
                He had a cold last week.
          19. v. To experience, go through, undergo.
                We had a hard year last year, with the locust swarms and all that.
                He had surgery on his hip yesterday.
                I'm having the time of my life!
          20. v. To trick, to deceive.
                You had me alright! I never would have thought that was just a joke.
          21. v. (transitive, often with present participle) To allow; to tolerate.
                The child screamed incessantly for his mother to buy him a toy, but she wasn't having any of it.
                I asked my dad if I could go to the concert this Thursday, but he wouldn't have it since it's a school night.
          22. v. (transitive, often used in the negative) To believe, buy, be taken in by.
                I made up an excuse as to why I was out so late, but my wife wasn't having any of it.
          23. v. To host someone; to take in as a guest.
                Thank you for having me!
          24. v. To get a reading, measurement, or result from an instrument or calculation.
                What do you have for problem two?
                I have two contacts on my scope.
          25. v. (transitive, of a jury) To consider a court proceeding that has been completed; to begin deliberations on a case.
                We'll schedule closing arguments for Thursday, and the jury will have the case by that afternoon.
          26. n. A wealthy or privileged person.
          27. n. (uncommon) One who has some (contextually specified) thing.
          28. n. (AU, NZ, informal) A fraud or deception; something misleading.
                They advertise it as a great deal, but I think it's a bit of a have.
each
     1. det. All; every; qualifying a singular noun, indicating all examples of the thing so named seen as individual or separate items (compare every).
           make sure you wash each bowl well;  the sun comes up each morning and sets each night
     2. det. Every one; every thing.
           I'm going to give each of you a chance to win.
     3. det. For one; per.
           The apples cost 50 cents each.
     4. n. (operations, philosophy) An individual item: the least quantitative unit in a grouping.
singleton
     1. n. (playing cards) A playing card that is the only one of its suit in a hand, especially at bridge.
     2. n. (playing cards) A hand containing only one card of a certain suit.
     3. n. A single object, especially one of a group.
     4. n. (computing) A class that may not be instantiated more than once, i.e. that implements the singleton design pattern.
     5. n. (mathematics) A set with exactly one element.
     6. n. A child or animal that is born singly, not as a twin or other multiple birth.
     7. n. A person without a romantic partner.
subset
     1. n. (set theory, of a set S) A set A such that every element of A is also an element of S.
           The set of integers is a subset of the set of real numbers. -
           The set\lbrace a, b\rbrace is a both a subset and a proper subset of\lbrace a, b, c\rbrace while the set\lbrace a, b, c\rbrace is a subset of\lbrace a, b, c\rbrace but not a proper subset of\lb
     2. n. A group of things or people, all of which are in a specified larger group.
           We asked a subset of the population of the town for their opinion. -
     3. v. To take a subset of.
     4. v. (transitive, computing, typography) To extract only the portions of (a font) that are needed to display a particular document.
open
     1. adj. (not comparable) Not closed; accessible; unimpeded.
           Turn left after the second open door.
           It was as if his body had gone to sleep standing up and with his eyes open.
     2. adj. Not drawn together, closed, or contracted; extended; expanded.
           an open hand; an open flower; an open prospect
     3. adj. (not comparable) Actively conducting or prepared to conduct business.
           Banks are not open on bank holidays.
     4. adj. (comparable) Receptive.
           I am open to new ideas.
     5. adj. (not comparable) Public
           He published an open letter to the governor on a full page of the New York Times.
     6. adj. (not comparable) Candid, ingenuous, not subtle in character.
           The man is an open book.
     7. adj. (mathematics, logic, of a formula) Having a free variable.
     8. adj. (mathematics, topology, of a set) Which is part of a predefined collection of subsets ofX, that defines a topological space onX.
     9. adj. (graph theory, of a walk) Whose first and last vertices are different.
     10. adj. (computing, not comparable, of a file, document, etc.) In current use; mapped to part of memory.
           I couldn't save my changes because another user had the same file open.
     11. adj. (business) Not fulfilled.
           I've got open orders for as many containers of red durum as you can get me.
     12. adj. Not settled or adjusted; not decided or determined; not closed or withdrawn from consideration.
           an open question
           to keep an offer or opportunity open
     13. adj. (music, stringed instruments) Without any fingers pressing the string against the fingerboard.
     14. adj. Not of a quality to prevent communication, as by closing waterways, blocking roads, etc.; hence, not frosty or inclement; mild; used of the weather or the climate.
           an open winter
     15. adj. (phonetics) Uttered with a relatively wide opening of the articulating organs; said of vowels.
     16. adj. (phonetics) Uttered, as a consonant, with the oral passage simply narrowed without closure.
     17. adj. (phonetics, of a syllable) That ends in a vowel; not having a coda.
     18. adj. (computing) Made public, usable with a free licence.
     19. adj. (medicine) Resulting from an incision, puncture or any other process by which the skin no longer protects an internal part of the body.
     20. v. To make something accessible or allow for passage by moving from a shut position.
           Turn the doorknob to open the door.
     21. v. To make (an open space, etc.) by clearing away an obstacle or obstacles, in order to allow for passage, access, or visibility.
           He opened a path through the undergrowth.
     22. v. To bring up, broach.
           I don't want to open that subject.
     23. v. To enter upon, begin.
           to open a discussion
           to open fire upon an enemy
           to open trade, or correspondence
           to open a case in court, or a meeting
     24. v. To spread; to expand into an open or loose position.
           to open a closed fist
           to open matted cotton by separating the fibres
           to open a map, book, or scroll
     25. v. To make accessible to customers or clients.
           I will open the shop an hour early tomorrow.
     26. v. To start (a campaign).
           Vermont will open elk hunting season next week.
     27. v. (intransitive) To become open.
           The door opened all by itself.
     28. v. (intransitive) To begin conducting business.
           The shop opens at 9:00.
     29. v. (intransitive, cricket) To begin a side's innings as one of the first two batsmen.
     30. v. (intransitive, poker) To bet before any other player has in a particular betting round in a game of poker.
           After the first two players fold, Julie opens for $5.
     31. v. (transitive, intransitive, poker) To reveal one's hand.
           Jeff opens his hand revealing a straight flush.
     32. v. (computing, transitive, intransitive, of a file, document, etc.) To load into memory for viewing or editing.
     33. v. (obsolete) To disclose; to reveal; to interpret; to explain.
     34. n. A sports event in which anybody can compete; as, the Australian Open.
     35. n. (electronics) A wire that is broken midway.
           The electrician found the open in the circuit after a few minutes of testing.
     36. n. (with the) Open or unobstructed space; an exposed location.
           I can't believe you left the lawnmower out in the open when you knew it was going to rain this afternoon!
           Wary of hunters, the fleeing deer kept well out of the open, dodging instead from thicket to thicket.
     37. n. (with the) Public knowledge or scrutiny; full view.
           We have got to bring this company's corrupt business practices into the open.
said
     1. v. simple past tense and past participle of say
     2. adj. Mentioned earlier; aforesaid.
           The said party has denied the charges.
     3. det. Mentioned earlier; aforesaid.
           Said party has denied the charges.
     say
          1. v. To pronounce.
                Please say your name slowly and clearly.
          2. v. To recite.
                Martha, will you say the Pledge of Allegiance?
          3. v. To tell, either verbally or in writing.
                He said he would be here tomorrow.
          4. v. To indicate in a written form.
                The sign says it’s 50 kilometres to Paris.
          5. v. (impersonal) To have a common expression; used in singular passive voice or plural active voice to indicate a rumor or well-known fact.
                They say "when in Rome, do as the Romans do", which means "behave as those around you do.".
          6. v. (informal, imperative) Suppose, assume; used to mark an example, supposition or hypothesis.
                A holiday somewhere warm – Florida, say – would be nice.
                Say he refuses. What do we do then?
                Say your family is starving and you don't have any money, is it ok to steal some food?
          7. v. (intransitive) To speak; to express an opinion; to make answer; to reply.
          8. v. (transitive, informal, of a possession, especially money) To bet as a wager on an outcome; by extension, used to express belief in an outcome by the speaker.
          9. n. A chance to speak; the right or power to influence or make a decision.
          10. adv. For example; let us assume.
                Pick a color you think they'd like, say, peach.
                He was driving pretty fast, say, fifty miles per hour.
          11. interj. (colloquial) Used to gain one's attention before making an inquiry or suggestion
                Say, what did you think about the movie?
          12. n. A type of fine cloth similar to serge.
          13. v. To try; to assay.
          14. n. Trial by sample; assay; specimen.
          15. n. Tried quality; temper; proof.
          16. n. Essay; trial; attempt.
          17. n. (Scotland) A strainer for milk.
of
     1. prep. Expressing distance or motion.
     2. prep.          (now obsolete, or dialectal) From (of distance, direction), "off".
     3. prep.          (obsolete except in phrases) Since, from (a given time, earlier state etc.).
     4. prep.          From, away from (a position, number, distance etc.).
                    There are no shops within twenty miles of the cottage.
     5. prep.          (North America, Scotland, Ireland) Before (the hour); to.
                    What's the time? / Nearly a quarter of three.
     6. prep. Expressing separation.
     7. prep.          (Indicating removal, absence or separation, with the action indicated by a transitive verb and the quality or substance by a grammatical object.)
                    Finally she was relieved of the burden of caring for her sick husband.
     8. prep.          (Indicating removal, absence or separation, with resulting state indicated by an adjective.)
                    He seemed devoid of human feelings.
     9. prep.          (obsolete) (Indicating removal, absence or separation, construed with an intransitive verb.)
     10. prep. Expressing origin.
     11. prep.          (Indicating an ancestral source or origin of descent.)
                    The word is believed to be of Japanese origin.
     12. prep.          (Indicating a (non-physical) source of action or emotion; introducing a cause, instigation); from, out of, as an expression of.
                    The invention was born of necessity.
     13. prep.          (following an intransitive verb) (Indicates the source or cause of the verb.)
                    It is said that she died of a broken heart.
     14. prep.          (following an adjective) (Indicates the subject or cause of the adjective.)
                    I am tired of all this nonsense.
     15. prep. Expressing agency.
     16. prep.          (following a passive verb) (Indicates the agent (for most verbs, now usually expressed with by).)
                    I am not particularly enamoured of this idea.
     17. prep.          (Used to introduce the "subjective genitive"; following a noun to form the head of a postmodifying noun phrase) (see also 'Possession' senses below).
                    The contract can be terminated at any time with the agreement of both parties.
     18. prep.          (following an adjective) (Used to indicate the agent of something described by the adjective.)
                    It was very brave of you to speak out like that.
     19. prep. Expressing composition, substance.
     20. prep.          (after a verb expressing construction, making etc.) (Used to indicate the material or substance used.)
                    Many 'corks' are now actually made of plastic.
     21. prep.          (directly following a noun) (Used to indicate the material of the just-mentioned object.)
                    She wore a dress of silk.
     22. prep.          (Indicating the composition of a given collective or quantitative noun.)
                    What a lot of nonsense!
     23. prep.          (Used to link a given class of things with a specific example of that class.)
                   Welcome to the historic town of Harwich.
     24. prep.          (Links two nouns in near-apposition, with the first qualifying the second); "which is also".
                    I'm not driving this wreck of a car.
     25. prep. Introducing subject matter.
     26. prep.          (Links an intransitive verb, or a transitive verb and its subject (especially verbs to do with thinking, feeling, expressing etc.), with its subject-ma
                    I'm always thinking of you.
     27. prep.          (following a noun (now chiefly nouns of knowledge, communication etc.)) (Introduces its subject matter); about, concerning.
                    He told us the story of his journey to India.
     28. prep.          (following an adjective) (Introduces its subject matter.)
                    This behaviour is typical of teenagers.
     29. prep. Having partitive effect.
     30. prep.          (following a number or other quantitive word) (Introduces the whole for which is indicated only the specified part or segment); "from among".
                    Most of these apples are rotten.
     31. prep.          (following a noun) (Indicates a given part.)
     32. prep.          (now archaic, literary, with preceding partitive word assumed, or as a predicate after to be) Some, an amount of, one of.
                    On the whole, they seem to be of the decent sort.
     33. prep.          (Links to a genitive noun or possessive pronoun, with partitive effect (though now often merged with possessive senses, below).)
                    He is a friend of mine.
     34. prep. Expressing possession.
     35. prep.          Belonging to, existing in, or taking place in a given location, place or time. Compare "origin" senses, above.
                    He was perhaps the most famous scientist of the twentieth century.
     36. prep.          Belonging to (a place) through having title, ownership or control over it.
                    The owner of the nightclub was arrested.
     37. prep.          Belonging to (someone or something) as something they possess or have as a characteristic; (the "possessive genitive". (With abstract nouns, this inter
                    Keep the handle of the saucepan away from the flames.
     38. prep. Forming the "objective genitive".
     39. prep.          (Follows an agent noun, verbal noun or noun of action.)
                    She had a profound distrust of the police.
     40. prep. Expressing qualities or characteristics.
     41. prep.          (now archaic, or literary) (Links an adjective with a noun or noun phrase to form a quasi-adverbial qualifier); in respect to, as regards.
                    My companion seemed affable and easy of manner.
     42. prep.          (Indicates a quality or characteristic); "characterized by".
                    Pooh was said to be a bear of very little brain.
     43. prep.          (Indicates quantity, age, price, etc.)
                    We have been paying interest at a rate of 10%.
     44. prep.          (US, informal considered incorrect by some) (Used to link singular indefinite nouns (preceded by the indefinite article) and attributive adjectives mod
                    It's not that big of a deal.
     45. prep. Expressing a point in time.
     46. prep.          (chiefly regional) During the course of (a set period of time, day of the week etc.), now specifically with implied repetition or regularity.
                    Of an evening, we would often go for a stroll along the river.
     47. prep.          (UK dialectal, chiefly in negative constructions) For (a given length of time).
                    I've not tekken her out of a goodly long while.
     48. prep.          (after a noun) (Indicates duration of a state, activity etc.)
                    After a delay of three hours, the plane finally took off.
a
     1. art. One; any indefinite example of; used to denote a singular item of a group.
           There was a man here looking for you yesterday.
     2. art. Used in conjunction with the adjectives score, dozen, hundred, thousand, and million, as a function word.
           I've seen it happen a hundred times.
     3. art. One certain or particular; any single.Brown, Lesley, (2003)
           We've received an interesting letter from a Mrs. Miggins of London.
     4. art. The same; one.
           We are of a mind on matters of morals.
     5. art. Any, every; used before a noun which has become modified to limit its scope; also used with a negative to indicate not a single one.Lindberg, Christine A. (2007)
           A man who dies intestate leaves his children troubles and difficulties.
           He fell all that way, and hasn't a bump on his head?
     6. art. Used before plural nouns modified by few, good many, couple, great many, etc.
     7. art. Someone or something like; similar to; Used before a proper noun to create an example out of it.
           The center of the village was becoming a Times Square.
     8. prep. (archaic) To do with position or direction; In, on, at, by, towards, onto.
           Stand a tiptoe.
     9. prep. To do with separation; In, into.
           Torn a pieces.
     10. prep. To do with time; Each, per, in, on, by.
           I brush my teeth twice a day.
     11. prep. (obsolete) To do with method; In, with.
     12. prep. (obsolete) To do with role or capacity; In.
           A God’s name.
     13. prep. To do with status; In.
           King James Bible (II Chronicles 2:18)
             To set the people a worke.
     14. prep. (archaic) To do with process, with a passive verb; In the course of, experiencing.
           1964, Bob Dylan, The Times They Are a-Changin’
             The times, they are a-changin'.
     15. prep. (archaic) To do with an action, an active verb; Engaged in.
           1611, King James Bible, Hebrews 11-21
             Jacob, when he was a dying
     16. prep. (archaic) To do with an action/movement; To, into.
     17. v. (archaic, or slang) Have.
           I'd a come, if you'd a asked.
     18. pron. (obsolete, outside, England, and Scotland dialects) He.
     19. interj. A meaningless syllable; ah.
     20. prep. (archaic, slang) Of.
           The name of John a Gaunt.
     21. adv. (chiefly Scotland) All.
     22. adj. (chiefly Scotland) All.
topological
     1. adj. (mathematics) of or relating to topology
space
     1. n. Of time.:
     2. n.          (now rare, archaic) Free time; leisure, opportunity.
     3. n.          A specific (specified) period of time.
     4. n.          An undefined period of time (without qualifier, especially a short period); a while.
     5. n. Unlimited or generalized physical extent.:
     6. n.          Distance between things.
     7. n.          Physical extent across two or three dimensions; area, volume (sometimes for or to do something).
     8. n.          Physical extent in all directions, seen as an attribute of the universe (now usually considered as a part of space-time), or a mathematical model of th
     9. n.          The near-vacuum in which planets, stars and other celestial objects are situated; the universe beyond the earth's atmosphere.
     10. n.          The physical and psychological area one needs within which to live or operate; personal freedom.
     11. n. A bounded or specific physical extent.:
     12. n.          A (chiefly empty) area or volume with set limits or boundaries.
     13. n.          (music) A position on the staff or stave bounded by lines.
     14. n.          A gap in text between words, lines etc., or a digital character used to create such a gap.
     15. n.          (metal type) A piece of metal type used to separate words, cast lower than other type so as not to take ink, especially one that is narrower than one e
     16. n.          A gap; an empty place.
     17. n.          (geometry) A set of points, each of which is uniquely specified by a number (the dimensionality) of coordinates.
     18. n.          (mathematics) A generalized construct or set whose members have some property in common; typically there will be a geometric metaphor allowing these me
                   Functional analysis is best approached through a sound knowledge of Hilbert space theory.
     19. n.          (figuratively) A marketplace for goods or services.
                   innovation in the browser space
     20. v. (obsolete, intransitive) To roam, walk, wander.
     21. v. To set some distance apart.
             Faye had spaced the pots at 8-inch intervals on the windowsill.
             The cities are evenly spaced.
     22. v. To insert or utilise spaces in a written text.
             This paragraph seems badly spaced.
     23. v. (transitive, science fiction) To eject into outer space, usually without a space suit.
             The captain spaced the traitors.
     24. v. (intransitive, science fiction) To travel into and through outer space.
or
     1. conj. Connects at least two alternative words, phrases, clauses, sentences, etc. each of which could make a passage true. In English, this is the "inclusive or." The "exclusive or" is formed by "either(...)
           In Ohio, anyone under the age of 18 who wants a tattoo or body piercing needs the consent of a parent or guardian.
           He might get cancer, or be hit by a bus, or God knows what.
     2. conj. (logic) An operator denoting the disjunction of two propositions or truth values. There are two forms, the inclusive or and the exclusive or.
     3. conj. Counts the elements before and after as two possibilities.
     4. conj. Otherwise (a consequence of the condition that the previous is false).
           It's raining! Come inside or you'll catch a cold!
     5. conj. Connects two equivalent names.
           The country Myanmar, or Burma
     6. n. (logic, electronics) alternative form of OR
     7. n. (tincture) The gold or yellow tincture on a coat of arms.
     8. adj. (tincture) Of gold or yellow tincture on a coat of arms.
     9. adv. (obsolete) Early (on).
     10. adv. (obsolete) Earlier, previously.
     11. prep. (now archaic, or dialect) Before; ere.
a
     1. art. One; any indefinite example of; used to denote a singular item of a group.
           There was a man here looking for you yesterday.
     2. art. Used in conjunction with the adjectives score, dozen, hundred, thousand, and million, as a function word.
           I've seen it happen a hundred times.
     3. art. One certain or particular; any single.Brown, Lesley, (2003)
           We've received an interesting letter from a Mrs. Miggins of London.
     4. art. The same; one.
           We are of a mind on matters of morals.
     5. art. Any, every; used before a noun which has become modified to limit its scope; also used with a negative to indicate not a single one.Lindberg, Christine A. (2007)
           A man who dies intestate leaves his children troubles and difficulties.
           He fell all that way, and hasn't a bump on his head?
     6. art. Used before plural nouns modified by few, good many, couple, great many, etc.
     7. art. Someone or something like; similar to; Used before a proper noun to create an example out of it.
           The center of the village was becoming a Times Square.
     8. prep. (archaic) To do with position or direction; In, on, at, by, towards, onto.
           Stand a tiptoe.
     9. prep. To do with separation; In, into.
           Torn a pieces.
     10. prep. To do with time; Each, per, in, on, by.
           I brush my teeth twice a day.
     11. prep. (obsolete) To do with method; In, with.
     12. prep. (obsolete) To do with role or capacity; In.
           A God’s name.
     13. prep. To do with status; In.
           King James Bible (II Chronicles 2:18)
             To set the people a worke.
     14. prep. (archaic) To do with process, with a passive verb; In the course of, experiencing.
           1964, Bob Dylan, The Times They Are a-Changin’
             The times, they are a-changin'.
     15. prep. (archaic) To do with an action, an active verb; Engaged in.
           1611, King James Bible, Hebrews 11-21
             Jacob, when he was a dying
     16. prep. (archaic) To do with an action/movement; To, into.
     17. v. (archaic, or slang) Have.
           I'd a come, if you'd a asked.
     18. pron. (obsolete, outside, England, and Scotland dialects) He.
     19. interj. A meaningless syllable; ah.
     20. prep. (archaic, slang) Of.
           The name of John a Gaunt.
     21. adv. (chiefly Scotland) All.
     22. adj. (chiefly Scotland) All.
topology
     1. n. (mathematics) A branch of mathematics studying those properties of a geometric figure or solid that are not changed by stretching, bending and similar homeomorphisms.
     2. n. (mathematics) A collection τ of subsets of a set X such that the empty set and X are both members of τ and τ is closed under finitary intersections and arbitrary unions.
     3. n. (medicine) The anatomical structure of part of the body.
     4. n. (computing) The arrangement of nodes in a communications network.
     5. n. (technology) The properties of a particular technological embodiment that are not affected by differences in the physical layout or form of its application.
     6. n. (topography) The topographical study of geographic locations or given places in relation to their history.
     7. n. (dated) The art of, or method for, assisting the memory by associating the thing or subject to be remembered with some place.
Dictionary entries from Wiktionary