volatility; rate of fluctuation; degree of variability
Technical term used in finance, statistics, and engineering to describe how much a value changes over time. The gloss 'regulation' is rare and may appear in older or specific technical contexts.
The volatility of this stock is very high.
Calculate the rate of fluctuation of the exchange rate.
expected volatility; implied volatility
Compound of 変動 (fluctuation) and 率 (rate).