ante meridiem

adjective
an·​te me·​ri·​di·​em | \ ˌan-ti-mə-ˈri-dē-əm How to pronounce ante meridiem (audio) , -dē-ˌem\

Definition of ante meridiem

: being before noon abbreviation AM, a.m., or (British) am

First Known Use of ante meridiem

1563, in the meaning defined above

History and Etymology for ante meridiem

Latin

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The first known use of ante meridiem was in 1563

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