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 Academy, an international school in Kobe, Japan
• Canadian Alliance, a former Canadian political party
• C&A stores
• Carmelo Anthony, NBA player
• Cary Academy, a North Carolina school
• Catamarca, a province in Argentina
• Cayman Airways, airline
• Central Administration
• Certified archivist
• Channel America, a defunct US television network
• Chartered accountant (CA)
• Chief of Army (Australia)
• 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, a Hong Kong based manufacturer of airsoft replicas
• Cocaine Anonymous
• Conscientious Arsonists, Greek terrorist organization
• Countryside Alliance, UK
• Creative Assembly, PC Game Developer
• Crédit Agricole
• Cricket Australia
• Cycling Australia

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
• Cả River, a river in Laos and Vietnam

Science and medicine

• Calcium, symbol for the chemical element (Ca)
• Cancer/Carcinoma
• Carbonic anhydrase
• Cardiac arrest
• 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)
• Cultural algorithm (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.

Other

• CA, Casio' s mobile phones in Japan.

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Source: adapted by the editor from Wikipedia, the free encyclopedia; from the article "CA". Image Credit.

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