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FM

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FM/ˈɛfˌɛm/noun
FM
/ˈɛfˌɛm/
noun
Learner's definition of FM  
[noncount]
: a system for sending radio signals in which the number of radio waves per second is changed in order to send information in the form of sound
FM is an abbreviation of “frequency modulation.”
— compare am

— FM

adjective
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