Dictionary.com Unabridged

ap-

1
variant of ad- before p: appear.

ap-

2
variant of apo- before a vowel or h: aphelion.

Ap.

2.
Apothecaries'.

A/P

1.
account paid.
2.
accounts payable.
3.
authority to pay or purchase.
Also, a/p.

a.p.

1.
additional premium.
2.
author's proof.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
ap (æp)
 
prefix
son of: occurring as part of some surnames of Welsh origin: ap Thomas
 
[from Welsh mab son]

AP
 
abbreviation for
1.  Air Police
2.  Associated Press

a.p.
 
abbreviation for
obsolete (in prescriptions, etc) ante prandium
 
[Latin: before a meal]

ap-
 
prefix
a variant of apo- : aphelion

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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Dictionary.com's 21st Century Lexicon
Main Entry:  AP
Part of Speech:  n
Definition:  See advanced placement
Dictionary.com's 21st Century Lexicon
Copyright © 2003-2014 Dictionary.com, LLC
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Etymonline
Word Origin & History

ap-
patronymic prefix in Welsh names, earlier map "son," cognate with Gaelic mac. Since 17c. merged into surnames (Ap Rhys = Price, Ap Evan = Bevan, etc.).

AP
abbreviation of Associated Press, first recorded 1879; the organization was founded May 1848 as co-operative news gathering effort among New York City newspaper publishers covering the war with Mexico.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ap. abbr.
apothecary

ap- 1
pref.
Variant of ad-.

ap- 2
pref.
Variant of apo-.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Abbreviations & Acronyms
AP
  1. access point

  2. adjective phrase

  3. advanced placement

  4. airplane

  5. air police

  6. American plan

  7. antipersonnel

  8. aorticopulmonary

  9. Armed Forces Pacific

  10. Associated Press

ap.
apothecary
Ap.
  1. Apostle

  2. April

a.p.
  1. additional premium

  2. author's proof

A/P
  1. account paid

  2. accounts payable

  3. authority to pay

  4. authority to purchase

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 ap
The ap covered the protest and reported on it by means of a podcast.
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