AM

AM

AM¹ [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. FM²

AM²

abbrev.

1. amplitude modulation

2. [L ante meridiem] before noon: used to designate the time from midnight to noon: also A.M., a.m., or am

3. [L Artium Magister] Master of Arts: also A.M.