Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “AM”


noun [U] (RADIO)    /ˌeɪˈem/
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)
Focus on the pronunciation of AM

Definitions of “AM” in other dictionaries

Word of the Day

prenuptial agreement

an official document signed by two people before they get married that says what will happen to their possessions and/or children if they divorce (= officially stop being married)

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More