/ Dictionary / Index S semicolon: Meaning and Definition of Find definitions for: sem•i•co•lon Pronunciation: (sem'i-kō"lun), [key] — n. the punctuation mark (;) used to indicate a major division in a sentence where a more distinct separation is felt between clauses or items on a list than is indicated by a comma, as between the two clauses of a compound sentence. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: semicolon (Thesaurus) semiclassical semicoma Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language