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a.m is an abbreviation and means before noon ie before 1200 hours. It comes from the Latin words ante meridiem (translated into English it means before midday)

p.m is an abbreviation and means after noon ie after 1200 hours. It comes from the Latin words post meridiem (translated into English it means after midday)

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13y ago
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13y ago

Pm is post merdiem and am is ante meridiem.

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Q: What does am and pm stand for in time?
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