- AMAM1 [ā′em′]n.amplitude-modulation broadcasting or sound transmission, characterized by the capability of transmitting over long distances and by a moderate to high level of noise and static: cf. FM2AM2abbrev.1. amplitude modulation2. [L ante meridiem] before noon: used to designate the time from midnight to noon: also A.M., a.m., or am3. [L Artium Magister] Master of Arts: also A.M.
English World dictionary. V. Neufeldt. 2014.