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AM = abbreviation for the Latin words "ante meridiem" (between midnight and noon)

PM = abbreviation for the Latin words "post meridiem" (between noon and midnight)

This is why A.M. is 12:00 midnight to 11:59 in the morning, and P.M. is 12:00 noon (i.e. the middle of the day) to 11:59 in the evening.

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10y ago

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