Science Fact Finder | Time, Weights, and Measures - What Do The Initials A.M. And P.M. Mean?

What do the initials a.m. and p.m. mean?

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.

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