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AM

noun [U] (RADIO)
 
 
/ˌeɪˈem/

Definition

abbreviation for amplitude modulation: a type of radio broadcasting in which the strength of the signal changes, producing sound of a lower quality than FM: You're listening to Radio Gold, broadcasting 24 hours a day on 909 AM.Radio
(Definition of AM noun (RADIO) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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