CA

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'CA' may stand for:

★ Circa (ca.).

★ Class A.
;People and organizations:

★ Air China, IATA airline designator (CA).

★ Bureau of Consular Affairs, a division of the US Department of State.

★ CA, Inc. (formerly known as Computer Associates).

★ Canadian Alliance, a former Canadian political party.

★ Cannabis Assembly, a UK organisation promoting the religious use of Cannabis.

★ C&A stores.

★ Carmelo Anthony, an NBA player.

★ Cary Academy, a North Carolina school.

★ Catamarca, a province in Argentina.

★ Cayman Airways, airline.

★ Central Administration

★ Channel America, a defunct US television network.

★ Chartered accountant (CA).

★ Christian anarchist, an adherent of Christian anarchism.

★ Christina Aguilera, singer and songwriter.

★ Citizens' Alliance, a political party in Trinidad and Tobago.

★ Civil Affairs, the official name for military units that conduct civil-military operations.

★ Classic Army, an Hong Kong based manufacturer of airsoft replicas.

★ Cocaine Anonymous.

★ Computer Associates.

★ Conscientious Arsonists, Greek terrorist organization

★ Countryside Alliance, UK.

★ Creative Assembly, PC Game Developer

★ Crédit Agricole.

★ Cycling Australia

★ Confidential Agreement

;Regional:

★ Cagliari, capital of the island of Sardinia, Italy (CA).

★ California (United States postal abbreviations)

★ Canada, ISO 3166, FIPS Pub 10-4 and obsolete NATO digram (CA).

★
★ .ca is also the ccTLD for Canada.

★ Carlisle, the United Kingdom postcode for the region in north-western England served by the Carlisle postal sorting office.

★ Catalan language, ISO 639 alpha-2 language code (ca).

★ Central America.
;Science and medicine:

★ Calcium, symbol for the chemical element (Ca).

★ Cancer/Carcinoma.

★ Carbonic anhydrase.

★ Cellular automaton.

★ Chemical Abstracts, an index of the scientific literature in chemistry and related fields, supplemented by abstracts.

★ Chromatic aberration.

★ Conversation analysis.

★ ''Cornu ammonis'', names of hippocampal subregions.
;Technology:

★ Armored cruiser, U.S. Navy hull classification symbol, pre 1930 (CA).

★ Centiampere, an SI unit of electric current (cA).

★ Certificate authority (or Certification Authority) (CA).

★ Computer Animation (CA).

★ Controlled atmosphere.

★ Controlled Availability (CA).

★ Cyanoacrylate, superglue.

★ Heavy cruiser, U.S. Navy hull classification symbol (CA).

★ Conditional access, Conditional Access (Broadcast).

★ Compressed Air, such as ''"CA Piping"'' or ''"CA System"'' etc.