AC
AC may refer to any of the following, broken down by subject area.
Science
- Alternating current, a type of electric current
- Andrew Caudill
- Acetaldehyde (also Ac), an organic ion
- Acetate (also Ac), an organic ion
- Actinium (Ac), a chemical element
- Anterior commissure, a small bundle of nerve fibers that connect the right and left temporal lobes
- Anticipated Convection, the code for severe thunderstorm forecasts issued daily for the contiguous U.S. by the Storm Prediction Center
- Armored Cable, a type of power cable used by electricians
- attocoulomb (aC), an SI unit of electric charge
- Axiom of choice, a mathematical set theory concept
- Accessory cells, used in cell cultures
- Acromioclavicular joint in humans and other animals, frequently injured in sport
Places
- Antigua and Barbuda, an obsolete NATO digram
- Ascension Island, an island in the South Atlantic Ocean (ISO 3166-1 country code)
- Atlantic City, New Jersey
Computing
- .ac, Internet top-level domain name for Ascension Island
- .ac (second level), Internet second-level domain used to denote academic institutions in many countries
- Anonymous Coward, in the Slashdot online environment
- Authorization certificate or attribute certificate, a digital permission to use a service or resource
Transportation
- AC Schnitzer, an aftermarket tuner of BMW automobiles
- AC Cars, a brand of automobile
- AC Cobra, an Anglo-American sports car
- Aero City, a bus built by the Hyundai Motor Company
- Air Canada, as its IATA airline designator
- Aircraft (usually A/C)
- Algoma Central Railway, a now out-of-service railway in Northern Ontario, Canada
Ranks
- Aircraftman
- Assistant Commissioner
- Assistant Commissioner of Police of the Metropolis
- Companion of The Order of Australia, the highest rank appointed by The Order.
People
- Aleister Crowley, in "magickal" contexts
Sport
- AC Milan, an Italian football club
- Athletic Club
Music
- AC/DC, a rock group
- Adult contemporary music, a music genre also used to describe broadcast radio stations
- Animal Collective, an experimental music band
- Anal Cunt, a grindcore/noise punk group.
Entertainment
- The name of the ultimate computer at the end of time in Isaac Asimov's The Last Question
- After Colony, an alternate timeline in the Gundam metaseries for the universe of Gundam Wing
- "Alt Cataclius" or "After Cataclysm", a historical era in the timeline for the Dragonlance fictional universe
- Animal Crossing, a real-time village video game for the Nintendo Game Cube and Nintendo DS
- Armor Class, a combat-related parameter in the Dungeons & Dragons role playing game system
- A robotic fighter that is under the player's control in the video game series Armored Core
- Asheron's Call, a fantasy game in the massively multiplayer online role-playing (MMORPG) genre
- Final Fantasy VII: Advent Children
- Accurentum, a fictional chemical element from Star Trek
Organizations
- Akademikernes Centralorganisation, the Danish Confederation of Professional Associations
- Civic Alliance, a Romanian NGO
- Astronomy club, common in schools and tertiary institutions
- Ad Council
Miscellaneous
- Ac, another name for the Ansuz rune
- Air conditioning (and air conditioner), the mechanical process of cooling air in enclosed spaces
- Ante Christum, Latin for "before Christ"
- Anthrocon, a furry fandom convention
- Antichrist, in the Christian religion
- Associación Civil, a title for non profit organizations in Spain
- Atlantic College, one of the ten United World Colleges
- Member of the National Assembly for Wales
- Average cost in economics
- Assessment Centre in Human Resources