a.m

Dictionary.com Unabridged

a.m.

1.
before noon.
2.
the period from midnight to noon, especially 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:
< Latin ante merīdiem


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.

Master of Arts

noun
1.
a master's degree given usually in a specific branch of the humanities or social sciences.
2.
a person who has been awarded this degree. Abbreviation: M.A., A.M.

Origin:
1490–1500

A and M

Agricultural and Mechanical (college): Texas A and M.
Also, A&M.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
a.m., A.M., am or AM
 
abbreviation for
Compare p.m. ante meridiem
 
[Latin: before noon]
 
A.M., A.M., am or AM
 
abbreviation for
 
[Latin: before noon]
 
am, A.M., am or AM
 
abbreviation for
 
[Latin: before noon]
 
AM, A.M., am or AM
 
abbreviation for
 
[Latin: before noon]

Master of Arts
 
n
MA a degree, usually postgraduate and in a nonscientific subject, or the holder of this degree

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
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, © 2010 Douglas Harper
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American Heritage
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.
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