/ Dictionary / Index S September: Meaning and Definition of Find definitions for: Sep•tem•ber Pronunciation: (sep-tem'bur), [key] — n. the ninth month of the year, containing 30 days. Abbr.: Sept., Sep. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: september (Thesaurus) septectomy September Massacre Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language