Dictionary.com Unabridged

a.d.s.

autograph document, signed.

ad

1 [ad]
noun
2.
advertising: an ad agency.

Origin:
1835–45; by shortening

1. ad, add, odd ; 2. adds, ads, adz.

ad

2 [ad]
noun Tennis.
1.
advantage ( def 5 ).
2.
ad in, the advantage being scored by the server.
3.
ad out, the advantage being scored by the receiver.

Origin:
1945–50; by shortening

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
ad1 (æd)
 
n
short for advertisement

ad2 (æd)
 
n
short for advantage Brit equivalent: van

ad3
 
the internet domain name for
Andorra

AD
 
abbreviation for
1.  Compare BC anno Domini: 70 ad
2.  military active duty
3.  military air defence
4.  Dame of the Order of Australia
 
usage  In strict usage, ad is only employed with specific years: he died in 1621 ad, but he died in the 17th century (and not the 17th century ad). Formerly the practice was to write ad preceding the date (ad 1621), and it is also strictly correct to omit in when ad is used, since this is already contained in the meaning of the Latin anno Domini (in the year of Our Lord), but this is no longer general practice. bc is used with both specific dates and indications of the period: Heraclitus was born about 540 bc; the battle took place in the 4th century bc

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

ad
1841, shortened form of advertisement. Long resisted by those in the trade, and denounced 1918 by the president of a national advertising association as "the language of bootblacks, ... beneath the dignity of men of the advertising profession."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

AD abbr.
Latin auris dextra (right ear)

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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FOLDOC
Computing Dictionary

ADS definition


An expert system.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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American Heritage
Abbreviations & Acronyms
ADS
  1. alternative delivery systems

  2. American Dialect Society

ad
advertisement
AD
  1. active duty

  2. air-dried

  3. Alzheimer's disease

  4. athletic director

  5. average deviation

a.d.s.
autograph document, signed
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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Example sentences for ads
Spy sequences have also been seen in tv ads for mountain dew soda.
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