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AM is an abbreviation of the Latin ante meridiem. The Latin word meridies means noon or midday.

PM is an abbreviation for post meridiem.

An easy way to remember the two abbreviations is: AM = After Midnight; PM = Prior to Midnight, or Pre-Midnight.

During World War One the British Army Corps of Signals converted the abbreviations AM and PM to Ack Emma and Pip Emma as part of their military communications alphabet, or 'spelling alphabet'.

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14y ago

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