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- Certificate Authority. An authority trusted and authorised to issue and revoke Digital Certificates. The Certificate Authority is also responsible for maintaining the Certificate Revocation List.
- calcium: a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals
- ca.: The Latin word circa, literally meaning about, is often used to describe various dates (often birth and death dates) that are uncertain.
- .ca is the Internet country code top-level domain (ccTLD) for Canada.