A.M.
abbreviation- airmail
- or A.M. Latin anno mundi (in the year of the world)
- 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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