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post me·ri·di·em | \ ˌpōs(t)-mə-ˈri-dē-əm 
, -ˌem \
, -ˌem \Definition of post meridiem
: being after noon
—abbreviation PM, p.m., or (British) pm
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Time Traveler for post meridiem
The first known use of post meridiem was in 1647
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