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A.M.

abbreviation
  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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