ac

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AC¹

noun ACs · a.c. · A/C · a/c · A.C.

  1. abbreviation, countable, initialism, uncountable Initialism of absolute ceiling
  2. abbreviation, countable, initialism, uncountable Initialism of access control
  3. abbreviation, countable, initialism, uncountable Initialism of account current
  4. abbreviation, countable, initialism, uncountable Initialism of anterior chamber
  5. abbreviation, countable, initialism, uncountable Initialism of adult contemporary (a radio format).
  6. abbreviation, countable, initialism, uncountable Initialism of adenylyl cyclase
  7. abbreviation, countable, initialism, uncountable 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)
  8. abbreviation, initialism, uncountable Initialism of air conditioning
  9. abbreviation, countable, initialism Initialism of air conditioner Our summer electric bill is around $120/month just from using 15,000 and 10,000 btu ACs.
  10. abbreviation, countable, initialism, uncountable Initialism of air corps
  11. abbreviation, countable, initialism, uncountable Initialism of aircraftman
  12. abbreviation, countable, initialism, uncountable Initialism of alternating current (often used to indicate an alternating potential rather than a current). 110 V AC
  13. broadly, countable, informal, uncountable supply of electric energy via a public electricity grid
  14. abbreviation, countable, initialism, uncountable Initialism of area code
  15. abbreviation, countable, initialism, uncountable Initialism of army corps
  16. abbreviation, countable, initialism, uncountable Initialism of athletic club
  17. abbreviation, countable, initialism, uncountable Initialism of author's correction
  18. abbreviation, countable, initialism, uncountable Initialism of automobile club
  19. US, abbreviation, countable, initialism, uncountable Initialism of Auxiliary Collier (a naval coal transport that travels with the fleet to provide coal for coal-powered warships).
  20. abbreviation, countable, initialism, uncountable Initialism of axiom of choice
  21. UK, abbreviation, countable, initialism, uncountable Initialism of assistant commissioner, a police rank used in London's Metropolitan Police.
  22. Australia, countable, uncountable Companion of the Order of Australia.
  23. abbreviation, countable, initialism, uncountable Initialism of aviation cadet
  24. abbreviation, countable, initialism, uncountable Initialism of ammonium chloride
  25. abbreviation, countable, initialism, uncountable Initialism of autonomous county
  26. abbreviation, countable, initialism, uncountable Initialism of armor class
  27. countable, singular, uncountable singular of ACs (“autistics and cousins”).
  28. abbreviation, countable, initialism, uncountable Initialism of administrative custody We the women in A.C. are on a hunger strike.
  29. abbreviation, countable, initialism, uncountable Initialism of Anglo-Catholic
  30. abbreviation, countable, initialism, uncountable Initialism of asphalt concrete
  31. abbreviation, countable, initialism, uncountable Initialism of asphalt cement
  32. abbreviation, countable, initialism, uncountable Initialism of asphalt content

adjective a.c. · A/C · a/c · A.C. · ac

  1. abbreviation, initialism, not comparable Initialism of acromioclavicular AC joint; AC separation
  2. abbreviation, initialism, not comparable Initialism of air conditioned
  3. abbreviation, initialism, not comparable Initialism of antichristian

adverb a.c. · A/C · a/c · A.C. · ac

  1. abbreviation, initialism, not comparable Initialism of anno Christi (in the year of Christ).

    Similar: AD

  2. abbreviation, initialism, not comparable Initialism of ante Christum, (before Christ).

    Similar: BC

Opposite: antonym(s) of

phrase a.c. · A/C · a/c · A.C. · ac

  1. abbreviation, initialism Initialism of all clear (as in button on electronic calculator).
  2. abbreviation, initialism Initialism of ante cibum (before meals).
  3. abbreviation, initialism Initialism of as charged, as in: guilty as charged, usually a/c.

proper noun a.c. · A/C · a/c · A.C. · ac

  1. abbreviation Abbreviation of Aceh: a province of Indonesia.
  2. abbreviation Abbreviation of Acre: a state of Brazil.
  3. abbreviation, initialism Initialism of America's Cup (competition yacht sailing match racing regatta).
  4. abbreviation, initialism Initialism of Appeal Cases (a subseries of Incorporated Council of Law Reporting's Law Reports).

verb ACs · ACing · ACed · a.c. · A/C

  1. abbreviation, initialism Initialism of air-condition My heating and cooling bills were within reason for the past 3 years. We only ran the AC/Heat from 6pm to midnight, but with the arrival of my son and mother-inlaw^([sic]) we must heat and AC 24 hrs a day.

ac²

Where it comes from

Abbreviation.

noun acs

  1. account; money of account
  2. alicyclic
  3. abbreviation Abbreviation of acre
  4. Alternative letter-case form of AC (“air conditioning”).
  5. Alternative letter-case form of AC (“alternating current”).

adjective

  1. not comparable ante cibum, before meals

Ac³

noun Acs

  1. slang The Acura Legend automobile. With the Mac in the Ac door paneling

noun

  1. abbreviation, initialism Initialism of air-conditioning
  2. abbreviation, initialism Initialism of altocumulus cloud
  3. abbreviation Abbreviation of acetate
  4. abbreviation Abbreviation of acetyl

Thesaurus

Closest in meaning: alternating current, actinium, spi, bisect, aircon, air-conditioning, air conditioner, cooler, cooling, cooling system, climate control, hvac, ventilation, refrigeration, central air, temperature control

adverb

Opposite: antonym(s) of

Translations

Every language

noun alternating current

EspañolCA, corriente alterna
한국어교류 gyoryu
日本語交流 kōryū
PortuguêsCA
DeutschWechselstrom
Românăcurent alternativ, c.a.
Русскийпереме́нный ток pereménnyj tok

noun alternating potential

DeutschWechselspannung

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Cite this
MLA

"ac." Wiktionary, via Micwyn, micwyn.com/word/ac. Accessed 6 Nov. 2026.

APA

ac. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/ac

Chicago

"ac." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/ac.

BibTeX
@misc{ac_2026,
  title = {ac},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/ac},
  urldate = {2026-11-06}
}