frequency
/ˈfriːkwənsɪ/noun
(pl. -ies)
1
- mass noun the rate at which something occurs or is repeated over a particular period of time or in a given sample频度, 频率：
shops have closed with increasing frequency during the period.
在这段时间里已有越来越多的商店歇业。
1.1
- the fact of being frequent or happening often频繁。
2
- the rate at which a vibration occurs which constitutes a wave, either in a material (as in sound waves), or in an electromagnetic field (as in radio waves and light), usually measured per second. (Symbol: f or v).（波的）振动频率（符号： f或v）。
2.1
- the particular waveband at which a radio station or other system broadcasts or transmits signals（电台或其他系统广播或传输信号的）频带, 波段。
词源
mid 16th cent. （gradually superseding late Middle English frequence; originally denoting a gathering of people）： from Latin frequentia, from frequens， frequent- 'crowded, frequent'.