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an·te me·ri·di·em | \ ˌan-ti-mə-ˈri-dē-əm 
, -dē-ˌem \
, -dē-ˌem \Definition of ante meridiem
: being before noon
—abbreviation AM, a.m., or (British) am
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Time Traveler for ante meridiem
The first known use of ante meridiem was in 1563
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