Coll.—Collector; Colloquial; College; Collection.
Com.—Commerce; Committee; Commentary; Commissioner; Commodore.
Com. Arr.—Committee of Arrangements.
Comdg.—Commanding.
Comm.—Commentary.
Comp.—Compare; Compound.
Com. Ver.—Common Version (of the Bible.)
Con.—Contra, against; in opposition.
Con. Cr.—Contra credit.
Conch.—Conchology.