/ Dictionary / Index S seventy-eighth: Meaning and Definition of Find definitions for: sev•en•ty-eighth Pronunciation: (sev'un-tē-ātth', -āth'), [key] — adj. next after the seventy-seventh; being the ordinal number for 78. being one of 78 equal parts. —n. a seventy-eighth part, esp. of one (). the seventy-eighth member of a series. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. seventy-eight seventy-fifth 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