fluctuation

noun

the quality of being unsteady and subject to changes
不安定で、変動しやすい性質
- he kept a record of price fluctuations
  彼は価格の変動を記録に残した
an instance of change
変化する例

the rate or magnitude of change
変化する為替レートやマグニチュード
a wave motion
波動
- the fluctuations of the sea
  海の変動

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