AC or Ac may refer to:
  • Air conditioning
    Air conditioning
    An air conditioner is a home appliance, system, or mechanism designed to dehumidify and extract heat from an area. The cooling is done using a simple refrigeration cycle...

    , the mechanical process of cooling air in enclosed spaces
  • Air conditioner, a machine that produces cool air
  • Anarcho-capitalism
    Anarcho-capitalism is a libertarian and individualist anarchist political philosophy that advocates the elimination of the state in favour of individual sovereignty in a free market...

    , a form of free-market anarchism
  • Ante Christum, a Latin term meaning "before Christ"
  • Anthrocon
    Anthrocon is the world's largest furry convention, taking place in Pittsburgh, Pennsylvania each June or July. Its focus is on furries: fictional anthropomorphic animal characters in art and literature...

    , the largest furry convention in the world held in Pittsburgh, Pennsylvania.
  • Average cost
    Average cost
    In economics, average cost or unit cost is equal to total cost divided by the number of goods produced . It is also equal to the sum of average variable costs plus average fixed costs...

    , in economics
  • Assessment center
    Assessment center
    An assessment center is a process used in the selection of qualified individuals for a job or role in an organization. As another hiring tool for recruiting employees, the assessment center, in my eyes, can be ideal for an employer to get an idea of how the applicants will perform in the...

    , a process to evaluate candidates for a job


  • Actinium
    Actinium is a radioactive chemical element with the symbol Ac and atomic number 89, which was discovered in 1899. It was the first non-primordial radioactive element to be isolated. Polonium, radium and radon were observed before actinium, but they were not isolated until 1902...

    , a chemical element
  • Acetyl
    In organic chemistry, acetyl is a functional group, the acyl with chemical formula COCH3. It is sometimes represented by the symbol Ac . The acetyl group contains a methyl group single-bonded to a carbonyl...

    , a functional group in chemistry
  • Acromioclavicular joint
    Acromioclavicular joint
    The acromioclavicular joint, or AC joint, is a joint at the top of the shoulder. It is the junction between the acromion and the clavicle. -Function:...

     (AC joint), the shoulder junction between the scapula and the clavicle
  • Adenylate cyclase
    Adenylate cyclase
    Adenylate cyclase is part of the G protein signalling cascade, which transmits chemical signals from outside the cell across the membrane to the inside of the cell ....

    , a lyase enzyme
  • Chemotherapy regimens
    Chemotherapy regimens
    A fundamental philosophy of combination cancer therapy is that different drugs work through different cytotoxic mechanisms. Because they have different dose-limiting adverse effects, they can be given together at full doses in chemotherapy regimens....

    , adriamycin and cyclophosphamide, a chemotherapy regimen used to treat breast cancer
  • Alternating current
    Alternating current
    In alternating current the movement of electric charge periodically reverses direction. In direct current , the flow of electric charge is only in one direction....

    , a type of electric current
    • AC power
      AC power
      Power in an electric circuit is the rate of flow of energy past a given point of the circuit. In alternating current circuits, energy storage elements such as inductance and capacitance may result in periodic reversals of the direction of energy flow...

      , a net transfer of energy over a complete cycle of the alternating current waveform
  • Artificial consciousness
    Artificial consciousness
    Artificial consciousness , also known as machine consciousness or synthetic consciousness, is a field related to artificial intelligence and cognitive robotics whose aim is to define that which would have to be synthesized were consciousness to be found in an engineered artifact .Neuroscience...

    , a field related to artificial intelligence and cognitive robotics
  • Axiom of choice, a mathematical set theory concept


  • Aachen (district)
    Aachen (district)
    The district of Aachen is a district in the west of North Rhine-Westphalia, Germany. Neighboring districts are Heinsberg, Düren, Euskirchen, and also the Netherlands province of Limburg and the Belgian province of Liège.- History :...

     (vehicle registration code AC), a district in Germany
  • Acre (state)
    Acre (state)
    Acre is one of the 27 states of Brazil. It is situated in the southwest of the Northern Region, bordering Amazonas to the north, Rondônia to the east, Bolivia to the southeast and the Ucayali Region of Peru to the south and west. It occupies an area of 152,581.4 km2, being slightly smaller...

    , a state in Brazil
  • Atlantic City, New Jersey
    Atlantic City, New Jersey
    Atlantic City is a city in Atlantic County, New Jersey, United States, and a nationally renowned resort city for gambling, shopping and fine dining. The city also served as the inspiration for the American version of the board game Monopoly. Atlantic City is located on Absecon Island on the coast...

    , a city in New Jersey, United States


  • AC (complexity)
    AC (complexity)
    In circuit complexity, AC is a complexity class hierarchy. Each class, ACi, consists of the languages recognized by Boolean circuits with depth O and a polynomial number of unlimited-fanin AND and OR gates....

    , a hierarchy of complexity classes found in circuit complexity
  • .ac
    .ac is the Internet country code top-level domain for Ascension Island. It is administered by NIC.AC, a subsidiary of the Internet Computer Bureau based in the United Kingdom.Registration for this domain is open to anyone...

    , Internet top-level domain name for Ascension Island
  • .ac (second level)
    .ac (second level)
    .ac is a second level domain for academic establishments, such as universities, colleges and research institutes. Many countries use .edu for the same purpose, for example in Australia, in Malaysia...

    , Internet second-level domain used to denote academic institutions in many countries
  • Authorization certificate
    Authorization certificate
    In computer security, an attribute certificate is a digital document containing attributes associated to the holder by the issuer. When the associated attributes are mainly used for authorization purpose, AC is called authorization certificate. AC is standardized in X.509...

     or attribute certificate, a digital permission to use a service or resource

Job titles / ranks

  • A person appointed Companion Of The Order of Australia
    Order of Australia
    The Order of Australia is an order of chivalry established on 14 February 1975 by Elizabeth II, Queen of Australia, "for the purpose of according recognition to Australian citizens and other persons for achievement or for meritorious service"...

  • Aelod y Cynulliad, the title for Members of the National Assembly for Wales
    National Assembly for Wales
    The National Assembly for Wales is a devolved assembly with power to make legislation in Wales. The Assembly comprises 60 members, who are known as Assembly Members, or AMs...

  • Aircraftman
    Aircraftman , or Aircraftwoman , is the lowest rank in the Royal Air Force and the air forces of several other Commonwealth countries....

    , an air forces rank
  • Assistant Commissioner of Police of the Metropolis
    Assistant Commissioner of Police of the Metropolis
    Assistant Commissioner of Police of the Metropolis, usually just Assistant Commissioner , is the third highest rank in London's Metropolitan Police, ranking below Deputy Commissioner and above Deputy Assistant Commissioner. There are usually four officers in the rank...

    , a rank in London's Metropolitan Police


  • AC, the name of the ultimate computer at the end of time in Isaac Asimov's The Last Question
    The Last Question
    "The Last Question" is a science fiction short story by Isaac Asimov. It first appeared in the November 1956 issue of Science Fiction Quarterly and was reprinted in the collections Nine Tomorrows , The Best of Isaac Asimov , Robot Dreams , the retrospective Opus 100 , and in Isaac Asimov: The...

  • After Colony, an alternate timeline in the Gundam metaseries for the universe of Gundam Wing
  • A.C. Newman, solo stage-name for Canadian musician Carl Newman
  • A.C. Slater, character in the American sitcom Saved by the Bell
  • AC Comics
    AC Comics
    AC Comics is a comic book publishing company started by Bill Black.AC Comics specializes in reprints of Golden Age comics from now-defunct companies whose properties lapsed into public domain and were not reprinted elsewhere...

    , a comic book publisher established in 1969
  • Armor Class
    Armor class
    In some role-playing games, armor class is a derived statistic that indicates how difficult it is to land a successful blow on a character with an attack...

    , a combat-related parameter in the Dungeons & Dragons role playing game system
  • Anal Cunt
    Anal Cunt
    Anal Cunt, also known as AxCx and A.C., was an American grindcore band that formed in Newton, Massachusetts in 1988. Since its inception, the band underwent a number of line-up changes. Known for its grindcore musical style and controversial lyrics, Anal Cunt released eight full-length studio...

    , an American musical group
  • Adult contemporary music
    Adult contemporary music
    Adult contemporary music is a broad style of popular music that ranges from lush 1950s and 1960s vocal music to predominantly ballad-heavy music with varying degrees of rock influence, as well as a radio format that plays such music....

    , a genre description used mainly in radio broadcasting.

Video games

  • Ace Combat
    Ace Combat
    Ace Combat is a hybrid arcade-simulation flight action video game series featuring 12 games, published by the Japanese company Namco Bandai Games...

    , a series of combat flight simulator games
  • Armored Core
    Armored Core
    Armored Core is a mecha-based video game series developed by From Software for the PlayStation Portable, PlayStation, PlayStation 2, PlayStation 3, Xbox 360 and Mobile Phone platforms. Armored Core games are Mecha Simulation/third-person shooters, in which the player pilots a large mecha called an...

    , a series featuring the eponymous robotic fighter under the player's control
  • Asheron's Call
    Asheron's Call
    Asheron's Call is a fantasy MMORPG for Microsoft Windows-based PCs developed and published by Turbine Entertainment. It was published by Microsoft until 2004. Asheron's Call is set on the continent of Dereth and its surrounding islands on the fictional planet of Auberean...

    , a fantasy massively multiplayer online role-playing game
  • Assault Cube, a free first-person shooter with pseudo-realistic gameplay, optimised for lower-end computers
  • Assassin's Creed
    Assassin's Creed
    Assassin's Creed is an award-winning historical third person, stealth action-adventure video game developed by Ubisoft for PlayStation 3, Xbox 360 and Microsoft Windows. The bulk of the game takes place during the Third Crusade, with the plot revolving around a sect known as the Secret Order of...

    , a series of historical sci-fi action/adventure games


  • AC Transit
    AC Transit
    AC Transit is an Oakland-based regional public transit agency serving the western half of Alameda County and parts of western Contra Costa County in the western, Bay-side area of the East Bay of the San Francisco Bay Area...

    , a regional public transit agency in the San Francisco Bay Area
  • Action Congress
    Action Congress
    The Action Congress of Nigeria , formerly known as Action Congress , is a classical liberal Nigerian political party formed via the merger of the Alliance for Democracy, the Justice Party, the Advance Congress of Democrats, and several other minor political parties in September 2006. The party...

    , a political party in Nigeria
  • Ad Council Japan (AC Japan), an organization that distributes Japanese public service announcements
  • Air Canada
    Air Canada
    Air Canada is the flag carrier and largest airline of Canada. The airline, founded in 1936, provides scheduled and charter air transport for passengers and cargo to 178 destinations worldwide. It is the world's tenth largest passenger airline by number of destinations, and the airline is a...

     (IATA code), an airline company
  • AC – The Danish Confederation of Professional Associations, an umbrella organisation for several Danish trade unions
  • AC Cars
    AC Cars
    AC Cars Group Ltd. formerly known as Auto Carriers Ltd. is a British specialist automobile manufacturer and one of the oldest independent car marques founded in Britain...

    , a British specialist automobile manufacturer
  • Civic Alliance Foundation
    Civic Alliance Foundation
    The Civic Alliance Foundation is a Romanian non-governmental organization . It is one of the largest Romanian NGOs, working for the consolidation of a civil society in the aftermath of the 42-year long communist regime. The AC has subsidiaries in 36 of the 41 counties, overseen by a 27-member...

     (Alianţa Civică), a Romanian non-governmental organization
  • Coast Alliance
    Coast Alliance
    The Coast Alliance was a regional Nicaraguan political coalition of five parties founded in 1997 in opposition to the Constitutionalist Liberal Party and the Sandinista National Liberation Front...

     (Alianza Costeña), a former regional political coalition in Nicaragua
  • Alternative for Change
    Alternative for Change
    Alternative for Change , formerly known as "Christian Alternative," is a Nicaraguan political party.It was founded by dissidents from the Nicaraguan Party of the Christian Path , most notably Orlando Tardencilla...

     (Alternativa por el Cambio), a political party in Nicaragua
  • Associated Content
    Associated Content
    Associated Content is a division of Yahoo that focuses on online publishing. Yahoo's Associated Content distributes a large variety of writing through its website and content partners, including Yahoo News.-History:...

    , an online publisher and distributor of original content
  • Ayala Corporation
    Ayala Corporation
    Ayala Corporation is a holding company for the diversified interests of the Ayala Group. Founded in the Philippines by the Spanish and German Ayala, Roxas, and Zobel families during colonial rule, it is the country's oldest and largest conglomerate...

     (Philippine Stock Exchange symbol), a holding company
  • Australia Council
    Australia Council
    The Australia Council, informally known as the Australia Council for the Arts, is the official arts council or arts funding body of the Government of Australia.-Function:...

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