fluctuation noun

ADJ. considerable, large, marked, sharp, violent, wide, wild | local, minor | rapid | short-term | cyclical, periodic, regular, seasonal seasonal fluctuations in the demand for labour | random | climatic, currency, economic, exchange rate, market, price, temperature

VERB + FLUCTUATION cause, produce factors which cause these exchange rate fluctuations | be subject to The number of students at a college can be subject to considerable fluctuation.

FLUCTUATION + VERB occur the climatic fluctuations that have occurred over the last ten years

PREP. ~ in There have been quite wide fluctuations in oil prices in recent years.