Dictionary![]() ![]() FM1. Electronics.frequency modulation: a method of impressing a signal on a radio carrier wave by varying the frequency of the carrier wave. 2. Radio.a system of radio broadcasting by means of frequency modulation. 3. of, pertaining to, or utilizing such a system. Cf. AM. Fm—Symbol, Chem. fermium. fm—Symbol, Physics. femtometer. fm.1. fathom. 2. from. f.m.(in prescriptions) make a mixture. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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