(sound, radio) the use of a modulating wave to vary the instantaneous frequency of a carrier wave

an electronic circuit that produces an output frequency that is an integral multiple of an input frequency

(uncountable) That part of the electromagnetic spectrum, between about 3 kHz and 300 MHz, within which radio waves are transmitted. / (countable) A frequency in this range.

Of or pertaining to electromagnetic radiation in the radio frequency band of the spectrum.

Of or pertaining to high frequency sound or other radiation. / Occurring or doing something very frequently.

(radio) The frequency area from 3 MHz through 30 MHz, commonly used for radio broadcasting.

plural of frequency modulation

(linguistics) A list of the most commonly used words, or phrases, in a particular language, corpus, etc.

Having a relatively low frequency

(statistics) The number of data points satisfying something divided by the total number of data points.