An Etymological Dictionary of Astronomy and Astrophysics

A combination of two or more waves resulting in the production of frequencies not present in the original waves, the new frequencies being usually the sums and differences of integral multiples of the frequencies in the original waves.
A wave which varies in some characteristic in accordance with the variations of a modulating signal. Compare continuous wave. See modulation

See also: Modulated, p.p. of → modulate; → wave.