/ Dictionary / Index S septivalent: Meaning and Definition of Find definitions for: sep•ti•va•lent Pronunciation: (sep"tu-vā'lunt), [key] — adj. Chem. having a valence of seven; heptavalent. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. septisyllable septuagenarian Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language