What Do The Initials A.M. And P.M. Mean?

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Jyotsana | Student, Grade 10 | (Level 1) Valedictorian

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A.M mean before noon and P.M mean after noon

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fact-finder | (Level 3) Valedictorian

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The initials a.m. stand for ante meridiem, Latin for "before noon." The initials p.m. stand for post meridiem, Latin for "after noon."

Source: Acronyms, Initialisms & Abbreviations Dictionary 1993, vol. 1, pp. 178, 2716.