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Adjective: ante meridiem  ,an-tee-mu'ri-dee-um or ,an-ti-mu'ri-dee,em
  1. Before noon
    - a.m.
Adverb: ante meridiem  ,an-tee-mu'ri-dee-um or ,an-ti-mu'ri-dee,em
  1. (Latin) before noon
    "let's meet at 11 ante meridiem";
    - A.M.

See also: antemeridian

Encyclopedia: Ante meridiem