(geography) Abbreviation of California, a state of the United States, North America / (geography) Abbreviation of Canada, a country in North America

(computing) Initialism of cellular automaton. / (computing) Initialism of certificate authority. / (US, nautical) Initialism of armored cruiser, a type of warship

Alternative spelling of ca.

Abbreviation of circa.

(dated, rare outside titles) Alternative form of &c. / etc.

(dated, rare outside titles) Alternative form of &c. / etc.

Informal abbreviation for casual

(electronics, communication) Initialism of channel-associated signalling.

(chemistry) Initialism of Chemical Abstracts Service. / (law, sports) Abbreviation of Court of Arbitration for Sport.

(law) Abbreviation of casualty.