CA

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).
• 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, 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).
• 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.