C [1] (also c) NOUN (pl. Cs or C's) 1) the third letter of the alphabet. 2) denoting the third item in a set. 3) Music the first note of the diatonic scale of C major. 4) the Roman numeral for 100. [ORIGIN: abbreviation of Latin centum 'hundred' .]
C [2] ABBREVIATION 1) (C.) Cape (chiefly on maps). 2) Celsius or centigrade. 3) (in names of sports clubs) City. 4) (©) copyright. 5) (in Britain) Conservative. 6) Physics coulomb(s).
SYMBOL the chemical element carbon.

English terms dictionary. 2015.