Meaning of FREQUENCY in English

■ noun ( plural frequencies )

1》 the rate at which something occurs over a particular period or in a given sample.

2》 the fact or state of being frequent.

3》 the rate per second of a vibration constituting a wave, e.g. sound, light, or radio waves.

↘the particular waveband at which radio signals are broadcast or transmitted.

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.