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a.m.

From Wiktionary, the free dictionary
See also:Appendix:Variations of "am"
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English

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Alternative forms

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Etymology

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Abbreviation ofante meridiem(“before noon”).

Pronunciation

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Adverb

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a.m. (notcomparable)

  1. (used after the hour) In the 12-hour period frommidnight tonoon (the first half of the day) when using the12-hour clock.
    • 1967, United States Travel Service,Plant Tours for International Visitors to the United States,page 49:
      Greenfield [...] Monday thru Friday, 9 to 12a.m.
    • 2001,Customs Service effects of proposed legislation on officers' pay, United States General Accounting Office,page45:
      One of the most common night shifts is the 12a.m.-to-8a.m. shift.
    • 2007, Khurana Rohit,Number Game 4,page144:
      We never say 12a.m. or 12 p.m. It's either 12 midnight or 12 noon, respectively.
    • 2009, Robert Bill,Medical Mathematics and Dosage Calculations for Veterinary Professionals,page348:
      The 12-hour clock usesA.M. for the morning hours of midnight (12:00A.M.) to almost noon (11:59A.M.) and the P.M. designation for the hours from noon (12:00 P.M.) to almost midnight (11:59 PM).
    • 2015, Arhlene A. Flowers,Global Writing for Public Relations,page141:
      The 12-hour clock, which is used in the U.S., Canada, and a few other countries, divides time into two cycles:a.m. (ante meridiem, Latin for before midday) from midnight, 12a.m., to 11:59a.m.; and p.m. (post meridiem, Latin for after midday) from noon, 12 p.m., to 11:59 p.m.
    • 2021, Jukka Heinonen, Ortzi Akizu-Gardoki, Sanna Ala-Mantila,Energy Efficient Cities of Today and Tomorrow,page196:
      The following daylight peaks are identified around lunchtime, from 12am to 1 pm, while for weekend days, the curve show several daylight peaks from 7am to late lunchtime, around 1 pm.
    • 2025 August 4, Bryan Robinson, “The ‘9-9-6 Work Schedule’ Could Be Coming To Your Workplace Soon”, inForbes‎[1], archived fromthe original on7 August 2025:
      Some AI startups are taking the workplace back to the dark ages, adopting the Chinese “9-9-6 work schedule” in which employees toil from 9:00a.m. to 9:00 p.m. six days a week from Monday to Saturday.

Usage notes

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  • As seen in the quotes above, "12 a.m." has sometimes been used to mean either noon or midnight. However, the National Institute of Standards and Technology contends that those uses are incorrect.
  • Some argue that it should not be used in English as a noun meaning "morning" on account of the fact that it is an abbreviation for a Latin adverbial phrase.

Synonyms

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Antonyms

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Translations

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before noon

Adjective

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a.m. (notcomparable)

  1. Initialism ofad modum.

Anagrams

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Dutch

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Pronunciation

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Adverb

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a.m.

  1. abbreviation ofamica manu: (delivered) by the hand of a friend (put on an address)
  2. abbreviation ofante meridiem:a.m., in the forenoon

Synonyms

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Portuguese

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Adverb

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a.m. (notcomparable)

  1. a.m.(before noon)/(antes do meio dia) (Portuguese language)
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