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a.m.

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A.M.

 
Use a.m. in a Sentence
1. a.m.
2. Master of Arts.
Origin:
< L Artium Magister
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a.m.

 
1. before noon.
2. the period from midnight to noon, esp. the period of daylight prior to noon: Shall we meet Saturday a.m.?
3. a morning newspaper, sometimes issued shortly before midnight.
Compare p.m.

Origin:
< L ante merīdiem

Usage note:
The abbreviation a.m. for Latin ante meridiem, meaning “before noon,” refers to the period from midnight until noon. One minute before noon is 11:59 a.m. One minute after noon is 12:01 p.m. Many people distinguish between noon and midnight by saying 12 noon and 12 midnight. Expressions combining a.m. with morning (6 a.m. in the morning) and p.m. with afternoon, evening, or night (9 p.m. at night) are redundant and occur most often in casual speech and writing. Both a.m. and p.m. sometimes appear in capital letters, especially in printed matter.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To a.m.
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.
an·te me·rid·i·em   (ān'tē mə-rĭd'ē-əm)   
adv.   & adj. Abbr. A.M. or a.m. or A.M.
Before noon. Used chiefly in the abbreviated form to specify the hour: 10:30 A.M.; an A.M. appointment. See Usage Note at A.M.

[Latin ante, before + merīdiem, accusative of merīdiēs, noon.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Word Origin & History

A.M. 
1762, abbreviation of L. ante meridiem "before noon."

a.m. 
type of radio wave broadcast; see amplitude.
Online Etymology Dictionary, © 2001 Douglas Harper
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Abbreviations & Acronyms
a.m.
Latin ante meridiem (before noon)
A.M.

  1. airmail

  2. Latin anno mundi (in the year of the world)

  3. Latin ante meridiem (before noon)

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
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