AC

Look up AC, ac, or a/c in Wiktionary, the free dictionary.

AC, A.C., A/C, or Ac often refers to:

Air conditioning, often abbreviated as A/C
Alternating current, a type of electrical current in which the current repeatedly changes direction

AC, A.C. or Ac may also refer to:

Arts and entertainment

Ace Combat, a series of combat flight simulator games
Animal Crossing, a series of community simulation games
Anonymous;Code, a visual novel in the Science Adventure series
Another Code, a series of adventure games
Armored Core, a series of mecha-based third person shooter games
Asheron's Call, a fantasy massively multiplayer online role-playing game
Assassin's Creed, a series of action-adventure games
Assetto Corsa, a racing simulator game
Astral Chain, an action-adventure hack and slash game
Armor Class, a combat-related parameter in the Dungeons & Dragons role playing game system
A.C., a character in Fortnite: Save the World

AC Comics, a comic book publisher established in 1969
A.C. Slater, a fictional character in the American sitcom Saved by the Bell
After Colony, an alternate timeline in the Gundam metaseries for the universe of Gundam Wing
AC, the name of the "ultimate computer" in Isaac Asimov's novel The Last Question
Asianovela Channel, a defunct Filipino TV channel

AC Cars, a British specialist automobile manufacturer
AC Spark Plug, Delco, AC-Delco, and ACDelco, automotive parts brands owned by General Motors
AC Restaurants, a hotel and restaurant chain in the Benelux
Air Canada, the flag carrier and largest airline of Canada (IATA code AC)
Allis-Chalmers, a former industrial conglomerate
Anderson, Clayton and Company, former American cotton trading firm
Associated Content, an online publisher and distributor of original content
Ayala Corporation, a holding company (Philippine Stock Exchange symbol AC)

Action Congress, a political party in Nigeria
Advisory Council on Youth, a non-governmental decision-making body in the Council of Europe.
Alternative for Change (Alternativa por el Cambio), a political party in Nicaragua
Coast Alliance (Alianza Costeña), a former regional political coalition in Nicaragua

AC – The Danish Confederation of Professional Associations, an umbrella organisation for several Danish trade unions
AC Transit, a regional public transit agency in the San Francisco Bay Area
Ad Council Japan (AC Japan), an organization that distributes Japanese public service announcements
Athletics Canada, the governing body of athletics in Canada
Civic Alliance Foundation (Alianţa Civică), a Romanian non-governmental organization
Anthrocon, the second largest furry convention in the world, held in Pittsburgh, Pennsylvania, US
Audit Commission (Hong Kong), a government department in Hong Kong Special Administrative Region
Aryan Circle, a white supremacist, Neo-Nazi prison gang spread throughout many U.S. correctional facilities

Aelod y Cynulliad, title for Members of the National Assembly for Wales
Aircraftman, an air forces rank
Ashoka Chakra (military decoration), India's highest peacetime military decoration
Assistant Commissioner of Police of the Metropolis, a rank in London's Metropolitan Police
Companion of the Order of Australia
First assistant camera or Second assistant camera, in film-making
Aviation Cadet, a military rank sometimes written as A/C

Acromioclavicular joint (AC joint), the shoulder junction between the scapula and the clavicle
Adenylate cyclase, a lyase enzyme
Adriamycin and cyclophosphamide, a chemotherapy regimen used to treat breast cancer
Ante cibum (ac), Latin for "before meal", commonly seen in medical prescriptions
Anterior commissure, a bundle of nerve fibers connecting the two temporal lobes of the brain
Anterior cruciate ligament (AC ligament or ACL), a major ligament in the knee
Appropriateness criteria, when it is appropriate to perform a medical procedure or service
Assist control, a former term for continuous mandatory ventilation, a mode of mechanical ventilation
Adenocarcinoma, a type of cancerous tumor
Allergic conjunctivitis, inflammation of the conjunctiva

.ac, Internet top-level domain name for Ascension Island
.ac (second-level domain), Internet second-level domain used to denote academic institutions in many countries
AC (complexity), a hierarchy of complexity classes found in circuit complexity
AC, initialism of access control
Artificial consciousness, a field related to artificial intelligence and cognitive robotics
Authorization certificate or attribute certificate, a digital permission to use a service or resource
Arithmetic coding, a form of entropy encoding used in lossless data compression
alternating component a.k.a. AC coefficient in discrete cosine transform
IEEE 802.11ac, a wifi standard using 5 GHz, released in Dec 2013

Altocumulus, a medium level cloud type
Anticipated convection, convective outlooks issued by the U.S. National Weather Service

Air conditioning, technologies for altering the temperature and humidity of air
Across corners (A/C), a measure of external diameter of hexagonal nuts
Alternating current, a type of electric current
- AC power, a net transfer of energy over a complete cycle of the alternating current waveform
Asphalt concrete, a type of road or path surfacing
Average cost, in economics
Axiom of choice, a mathematical concept in set theory
A US Navy hull classification symbol: Collier (AC)

Ac (rune) (ᚪ), a rune of the Anglo-Saxon fuþorc and a continuation of the Elder Fuþark ansuz
A.C. Milan, an Italian football club based in the city of Milan
Acre, a unit of area with the symbol ac
Advisory circular, a publication to provide guidance for compliance with airworthiness regulations
Ante Christum or A.C., a Latin term meaning "before Christ"
Antichrist, a Biblical prophecy about one who will oppose Jesus Christ and substitute himself in Christ's place
Appeal Cases, or A.C., a UK law reporter covering decisions of the House of Lords, Supreme Court, Privy Council, and Court of Appeal
Armor Class, a common property in role playing games used to determine the amount of armor a character has
Army Corps, an operational formation, sometimes known as a field corps, which consists of two or more divisions
Atlantic College, an international IB Diploma Programme residential Sixth Form College in the Vale of Glamorgan in Wales
Auto Calesa, a war-time short-body version of the Philippine jeepney