波動は英語で
fluctuation

英語の定義

波動
1. n. surge, fluctuation, undulation, pulsation

fluctuation
1. n. A motion like that of waves; a moving in this and that direction.
the fluctuations of the sea
2. n. A wavering; unsteadiness.
fluctuations of opinion
fluctuations of prices
3. n. In medicine, a wave-like motion or undulation of a fluid in a natural or abnormal cavity (e.g. pus in an abscess), which is felt during palpation or percussion.