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  1. The variation in the value of some parameter characterizing a periodic oscillation.
  2. Specifically, variation of some characteristic of a radio wave, called the carrier wave, in accordance with instantaneous values of another wave, called the modulating wave.
    Variation of amplitude is '[[Amplitudeamplitude modulation', variation of frequency is 'frequency modulation', and variation of phase is 'phase modulation'. The formation of very short bursts of a carrier wave, separated by relatively long periods during which no carrier wave is transmitted, is 'pulse modulation'.


This article is based on NASA's Dictionary of Technical Terms for Aerospace Use