Etymology
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post meridiem

"after noon, occurring after the sun has passed the meridian," applied to the time between noon and midnight, 1640s, Latin, from post "after" (see post-) + accusative of meridies "midday, noon" (see meridian).

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Definitions of post meridiem
1
post meridiem (adv.)
between noon and midnight;
Synonyms: P.M.
2
post meridiem (adj.)
after noon;
Synonyms: P.M.
From wordnet.princeton.edu