A.M. - Dictionary definition and pronunciation - Yahoo! Education
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A.M.

abbr.
  1. airmail.
  2. or a.m. Latin anno mundi (in the year of the world).
  3. also a.m. or a.m. ante meridiem.

Usage Note:
By definition, 12 a.m. denotes midnight, and 12 p.m. denotes noon, but there is sufficient confusion over these uses to make it advisable to use 12 noon and 12 midnight where clarity is required.


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