/ Dictionary / Index S septennial: Meaning and Definition of Find definitions for: sep•ten•ni•al Pronunciation: (sep-ten'ē-ul), [key] — adj. occurring every seven years. of or for seven years. —n. something that occurs every seven years. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. septendecillion septentrion Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language