1. (n.) The number of times an occurrence is repeated in a time period; as, the frequency of crimes; the frequency of miracles\.

2. (n.) A crowd; a throng.

AF CPS EHF HF Hz MF RF SHF UHF VHF VLF amplitude antinode audio frequency carrier frequency crest cycles de Broglie wave diffraction electromagnetic radiation electromagnetic wave extremely high frequency fluctuation frequency band frequency spectrum fundamental fundamental tone guided wave harmonic harmonic motion hertz high frequency in phase interference intermediate frequency intonation kilocycles kilohertz libration light longitudinal wave low frequency lower frequencies mechanical wave medium frequency megacycles megahertz monotone monotony node nutation oscillation out of phase overtone partial partial tone pendulation period periodic wave periodicity pitch radio frequency radio wave ray reinforcement resonance resonance frequency seismic wave shock wave sound wave spark frequency spectrum superhigh frequency surface wave tidal wave tone tonelessness transverse wave trough ultrahigh frequency upper frequencies vacillation very high frequency very low frequency vibrancy vibratility vibration wave wave equation wave motion wave number wavelength wavering