Dictionary definitions
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ca[
From The Collaborative International Dictionary of English v.0.48:
Ca \Ca\ n.
the chemical symbol for calcium, the fifth most abundant
element in the earth's crust, having an atomic number of 20.
Syn: calcium.
[WordNet 1.5]
.
From The Collaborative International Dictionary of English v.0.48:
circa \cir"ca\ (s[~e]r"k[.a]), adv., prep. [L.] Approximately; about; commonly abbreviated ca.; -- used especially before dates and numerical measures; as, he was born circa 1650; ca. 50 feet high. Syn: ca. [PJC]
