WordNet (r) 3.0 (2006):
amplitude modulation n 1: modulation of the amplitude of the (radio) carrier wave [syn: amplitude modulation, AM]The Free On-line Dictionary of Computing (30 December 2018):
Amplitude Modulation(AM) A method of encoding data by varying the amplitude of a constant frequency carrier. Contrast Frequency Modulation. (2001-04-30)