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A.M. is an abbreviation for the Latin words "Ante meridian," which translates in English to "before the middle of the day." P.M. is an abbreviation for the Latin words "Post meridian," which translates in English to "after the middle of the day." That 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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11y ago

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