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"AM" stands for "ante meridian", while "PM" stands for "post meridian".

As the Earth spins, the Sun passes over your line of longitude - your "meridian" - at noon. "Ante" is Latin for "before", and "post" is derived from the Latin for "after". So "AM", before the Sun passes your longitude at noon, and "PM" means after the Sun passes your meridian at noon.

In other contexts, PM can stand for other things, like Prime Minister.

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7y ago

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