from The American Heritage® Dictionary of the English Language, 5th Edition.

  • abbreviation adult contemporary (radio format)
  • abbreviation air conditioning
  • abbreviation air-cool
  • abbreviation alternating current
  • abbreviation area code

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • initialism absolute ceiling
  • initialism account current
  • initialism acre
  • initialism music adult contemporary, a radio format
  • initialism air conditioning; air conditioned, usually: A/C
  • initialism air corps
  • initialism aircraftman
  • initialism all clear, as in button on electronic calculator
  • initialism electricity alternating current; often used to indicate an alternating potential rather than a current, as in 110V AC.
  • initialism anno Christi, in the year of Christ.
  • initialism ante Christum before Christ.
  • initialism medicine ante cibum before meals.
  • initialism religion antichristian
  • initialism appellation contrôlée
  • initialism area code
  • initialism army corps
  • initialism law as charged, as in: guilty as charged, usually: a/c
  • initialism athletic club
  • initialism Internet, slang audible chuckle
  • initialism author's correction
  • initialism automobile club
  • initialism US, military Auxiliary Collier - a naval coal transport that travels with the fleet to provide coal for coal powered warships
  • initialism set theory axiom of choice
  • initialism Australia Companion of the Order of Australia.
  • initialism aviation cadet
  • abbreviation Aceh, an autonomous province of Indonesia.
  • abbreviation Acre, a state of Brazil.


Sorry, no etymologies found.


Help support Wordnik (and make this page ad-free) by adopting the word AC.



Log in or sign up to get involved in the conversation. It's quick and easy.