fluctuation
noun [ C or U ]
uk/ˌflʌktʃuˈeɪʃən/ usa situation in which prices, levels or interest rates go up and down:
TV channel executives called the drop in viewing figures "a short-term fluctuation".
price/market/currency fluctuations
fluctuations in sth Employers can adjust their workforce in line with fluctuations in demand for goods and services.
fluctuations of sth Long-term investment trusts compensate investors for the day-to-day fluctuation of the stock market.