ap

1. abbreviationnot comparableAbbreviation of apothecaries' system.

   ap oz

   apothecaries’ ounce

1. abbreviationinitialismnot comparableInitialism of all-purpose.
2. abbreviationinitialismnot comparableInitialism of alternately placed.
3. abbreviationinitialismnot comparablemedicineInitialism of anteroposterior.

   AP radiograph shows an exophytic type of exostosis. [image caption]

   2016, B.J. Manaster, “Osteochondroma”, in B.J. Manaster, editor, Diagnostic Imaging: Musculoskeletal: Non-Traumatic Disease, 2nd edition, Philadelphia, PA: Elsevier, →ISBN, page 250

4. abbreviationinitialismnot comparablegovernmentInitialism of anti-personnel.
5. abbreviationinitialismnot comparablegovernmentInitialism of armor-piercing.

plural APs

1. UScountableeducationAn Advanced Placement program.
2. countableAn Audemars Piguet watch.

   I put her in a new AP

   2018-19', Roddy Rich, Ballin (song)

   1 more example

   I keep my niggas private, so his AP all I'm showing

   2020, Megan Thee Stallion, Savage (song)

3. abbreviationcountableinitialismcomputingInitialism of access point.
4. abbreviationinitialismuncountableaccountingInitialism of accounts payable.
5. abbreviationinitialismuncountablechemistryInitialism of acetylpyrroline.
6. abbreviationcountableinitialismvideo gamesInitialism of action point.

   Weapon attacks by your team members don't cost AP, but their special skills do, so managing these and exploiting them to target enemy weaknesses is key.

   2025 February 28, Robert Jones, “Clair Obscur: Expedition 33”, in PC Gamer (US), number 392, page 30

7. abbreviationcountableinitialismgrammarInitialism of adjective phrase or adverbial phrase.
8. abbreviationcountableinitialismgamblingInitialism of advantage player.
9. abbreviationinitialismuncountablemedicineInitialism of aerosolized pentamidine.

   He pointed out that the annual cost of AP prophylaxis is $2100, and that a single hospitalization for pneumocystis carinii pneumonia (PCP) costs six times that amount. (AP is generally regarded as an effective preventive for PCP)

   1989 April 22, Chris Bull, “Medicare Planning To Cut Funding For AIDS Drugs”, in Gay Community News, page 1

10. abbreviationcountableinitialismInitialism of affair partner.
11. abbreviationuncountablecookingAbbreviation of all-purpose flour.
12. abbreviationinitialismuncountableInitialism of age progression.

    Antonyms: AR

13. USabbreviationinitialismuncountableInitialism of American plan.
14. abbreviationinitialismuncountableInitialism of attachment parenting.
15. abbreviationcountableinitialismInitialism of authorized participant.
16. abbreviationcountableinitialismbankingInitialism of automatic payment.
17. USabbreviationcountableuncountablegovernmentAbbreviation of Auxiliary Provisions (a naval transport).
18. abbreviationinitialismuncountableaerospaceInitialism of ammonium perchlorate.
19. abbreviationinitialismuncountablemedicineInitialism of acute pancreatitis.
20. abbreviationcountableinitialismlawInitialism of additional protocol.
21. abbreviationcountableinitialismrhythm gamesInitialism of all perfect.

1. abbreviationinitialismInitialism of ActivityPub.
2. USabbreviationinitialismeducationInitialism of Advanced Placement.

   Joel is AP everything and he's applied to Harvard, so I guess his dad isn't taking any chances.

   2010, Jennifer Egan, “Ask Me if I Care”, in A Visit from the Goon Squad

3. abbreviationinitialismjournalismInitialism of Associated Press.

   Always consult the official Associated Press Stylebook for other AP questions and guidelines. The KSU Writing Center has current AP books available for use, as well as Writing Assistants to help you with AP format.

   2025 September 26 (last accessed), “AP STYLE: GENERAL RULES”, in Kennesaw State University, archived from the original on 26 Sep 2025, page 2

4. USabbreviationinitialismgovernmentInitialism of Armed Forces – Pacific.

   APO/FPO AP ZIPs 962-966 — Space Available Mail, Nov. 26; Parcel Airlift Mail, Dec. 3; Priority Mail, Dec. 10; First Class Mail Letters and Cards, Dec. 10 and Express Mail Military Service, Dec. 18.

   2010 October 29, Bill Shrum, “Shipping to soldiers for the holidays”, in Stuttgart (Arkansas) Daily Leader

5. Numerous places:
   1. abbreviationAbbreviation of Amapá: a state of Brazil.
   2. abbreviationinitialismInitialism of Andhra Pradesh: a state of India.
   3. abbreviationAbbreviation of Arabian Plate: a tectonic plate.

1. abbreviationAbbreviation of April.