frequency/ˋfrikwənsI; ˈfriːkwənsi/n plural frequencies 1 [U] the number of times that something happens 发生率﹐出现率: +of The frequency of his asthma attacks was increasing. 他的哮喘发病越来越频繁。He misses school with alarming frequency (=very often). 他频频缺课。 2 [C,U] the number of radio waves or sound waves that go past a point each second〔无线电波或声波的〕频率: sounds of very high frequency 频率非常高的声音