CA
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CA or ca may stand for:
- the IATA code for Air China
- C&A stores
- calcium (Ca): symbol for the chemical element
- California (State of, United States)
- Canada (ISO country code)
- Cellular automata
- Central America
- Catalan language (ISO 639 alpha-2)
- Certificate authority
- Channel America, a defunct US television network
- Chartered accountant
- Chemical Abstract
- circa
- Cocaine Anonymous
- Computer Associates
- Controlled Atmosphere
- Conversation analysis
- Counter Air
- Cyanoacrylate (superglue)
- heavy cruiser (CA): hull classification symbol
- Citizens' Alliance, a political party in Trinidad and Tobago