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a.m.

adverb

  1. period of the day after midnight and before noon
L44235 on Wikidata ↗

Wiktionary

adj

Etymology: Abbreviation of ante meridiem (“before noon”).

  1. Initialism of ad modum.

adv

Etymology: Abbreviation of ante meridiem (“before noon”).

  1. In the 12-hour period from midnight to noon (the first half of the day) when using the 12-hour clock.

    “Greenfield … Monday thru Friday, 9 to 12 a.m.”

    “One of the most common night shifts is the 12 a.m.-to-8 a.m. shift.”

noun

  1. Initialism of anno mundi.
  2. Initialism of Master of Arts.