/ Dictionary / Index S septimal: Meaning and Definition of Find definitions for: sep•ti•mal Pronunciation: (sep'tu-mul), [key] — adj. of or based on the number seven. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. septillion septimana 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