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ac

noun, adj — 39 senses

ac

nounalso spelled AC, Ac

Etymology Abbreviation.

1

account; money of account

2

alicyclic

3

Abbreviation Abbreviation of acre.

4

Alternative letter-case form of AC (“air conditioning”).

5

Business, Electrical engineering, Electricity, Electromagnetism, Energy, Engineering, Natural sciences, Physical sciences, Physics Alternative letter-case form of AC (“alternating current”).

ac

adj

Etymology Abbreviation.

1

Medicine, Sciences ante cibum, before meals

Related terms
ac etiam

AC

noun
32 senses
  1. 1Initialism of absolute ceiling.
  2. 2Initialism of access control.
  3. 3Initialism of account current.
  4. 4Initialism of anterior chamber.
  5. 5Initialism of adult contemporary (a radio format).
  6. 6Initialism of adenylyl cyclase.
  7. 7Initialism of adjuvant chemotherapy.
  8. 8Initialism of air conditioning.
  9. 9Initialism of air conditioner.
  10. 10Initialism of air corps.
  11. 11Initialism of aircraftman.
  12. 12Initialism of alternating current (often used to…
  13. 13supply of electric energy via a public electricity grid
  14. 14Initialism of area code.
  15. 15Initialism of army corps.
  16. 16Initialism of athletic club.
  17. 17Initialism of author's correction.
  18. 18Initialism of automobile club.
  19. 19Initialism of Auxiliary Collier (a naval coal transport…
  20. 20Initialism of axiom of choice.
  21. 21Initialism of assistant commissioner, a police rank used…
  22. 22Companion of the Order of Australia.
  23. 23Initialism of aviation cadet.
  24. 24Initialism of ammonium chloride.
  25. 25Initialism of autonomous county.
  26. 26Initialism of armor class.
  27. 27singular of ACs (“autistics and cousins”).
  28. 28Initialism of administrative custody.
  29. 29Initialism of Anglo-Catholic.
  30. 30Initialism of asphalt concrete.
  31. 31Initialism of asphalt cement.
  32. 32Initialism of asphalt content.
1

Aeronautics, Aerospace, Aviation, Business, Engineering, Natural sciences, Physical sciences Abbreviation, Initialism Initialism of absolute ceiling.

2

Abbreviation, Initialism Initialism of access control.

3

Business, Finance Abbreviation, Initialism Initialism of account current.

4

Anatomy, Medicine, Sciences Abbreviation, Initialism Initialism of anterior chamber.

5

Broadcasting, Entertainment, Lifestyle, Media, Music, Radio Abbreviation, Initialism Initialism of adult contemporary (a radio format).

6

Biochemistry, Biology, Chemistry, Microbiology, Natural sciences, Physical sciences Abbreviation, Initialism Initialism of adenylyl cyclase.

7

Medicine, Sciences Abbreviation, Initialism Initialism of adjuvant chemotherapy.

  • Current UK practice, supported by NICE guidance is to complete local pelvic treatment with surgery±pre-operative radiotherapy, before considering systemic adjuvant chemotherapy (AC)2018, Gollins S et al., “A prospective phase II study of pre-operative chemotherapy then short-course radiotherapy for high risk rectal cancer: COPERNICUS”, in British Journal of Cancer:
8

Abbreviation, Initialism Initialism of air conditioning.

9

Abbreviation, Initialism Initialism of air conditioner.

  • Our summer electric bill is around $120/month just from using 15,000 and 10,000 btu ACs.1997 June 18, Brooks Taylor, “AC/Heat from ground?”, in sci.engr.heat-vent-ac (Usenet), archived from the original on 01 Jul 2026:
  • If you want to cool or heat specific rooms with better efficiency, more power, and less clutter than window ACs and space heaters—and less complexity than central HVAC—consider a mini-split system.2020 June 29, Doug Mahoney, Harry Sawyers, “The Best Ductless Mini Split Air Conditioner”, in Wirecutter, New York, N.Y.: The New York Times Company, →ISSN, →OCLC, archived from the original on 25 Jul 2020:
1 more example
  • Fewer than 20 percent of Europeans have air-conditioning, as opposed to nearly 90 percent of Americans, and while you’d think Europe’s governments and people would be rushing to fully integrate ACs into their cooling arsenal, that’s no simple task for a variety of reasons.2026 June 30, Chas Danner, “Europe’s Great AC Debate: Highlights, Hot Takes, and Hysteria”, in Intelligencer, New York, N.Y.: New York Media, →ISSN, →OCLC, archived from the original on 30 Jun 2026:
10

Abbreviation, Initialism Initialism of air corps.

11

Abbreviation, Initialism Initialism of aircraftman.

12

Business, Electrical engineering, Electricity, Electromagnetism, Energy, Engineering, Natural sciences, Physical sciences, Physics Abbreviation, Initialism Initialism of alternating current (often used to indicate an alternating potential rather than a current).

  • 110 V AC
13

Business, Electrical engineering, Electricity, Electromagnetism, Energy, Engineering, Natural sciences, Physical sciences, Physics Broadly, Informal supply of electric energy via a public electricity grid

14

Abbreviation, Initialism Initialism of area code.

15

Abbreviation, Initialism Initialism of army corps.

16

Abbreviation, Initialism Initialism of athletic club.

17

Abbreviation, Initialism Initialism of author's correction.

18

Abbreviation, Initialism Initialism of automobile club.

19

Government, Military, Politics, War US, Abbreviation, Initialism Initialism of Auxiliary Collier (a naval coal transport that travels with the fleet to provide coal for coal-powered warships).

20

Mathematics, Sciences, Set theory Abbreviation, Initialism Initialism of axiom of choice.

21

Government, Law enforcement UK, Abbreviation, Initialism Initialism of assistant commissioner, a police rank used in London's Metropolitan Police.

22

Australia Companion of the Order of Australia.

23

Abbreviation, Initialism Initialism of aviation cadet.

24

Chemistry, Natural sciences, Physical sciences Abbreviation, Initialism Initialism of ammonium chloride.

25

Geography, Natural sciences Abbreviation, Initialism Initialism of autonomous county.

26

Abbreviation, Initialism Initialism of armor class.

Roleplaying games

27

Human sciences, Psychology, Sciences singular of ACs (“autistics and cousins”).

28

Abbreviation, Initialism Initialism of administrative custody.

  • We the women in A.C. are on a hunger strike.1988 February 7, Delana Emery, “Women Prisoners On Hunger Strike For Equal Rights”, in Gay Community News, volume 15, number 29, page 5:
29

Abbreviation, Initialism Initialism of Anglo-Catholic.

30

Abbreviation, Initialism Initialism of asphalt concrete.

31

Abbreviation, Initialism Initialism of asphalt cement.

32

Abbreviation, Initialism Initialism of asphalt content.

Derived terms
AC/DC

Ac

noun
1

Slang The Acura Legend automobile.

African-American Vernacular

  • With the Mac in the Ac door paneling1994, Notorious B.I.G., Unbelievable:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — authors: page histories for ac, AC and Ac.