/ Dictionary / Index E eighth: Meaning and Definition of Find definitions for: eighth Pronunciation: (ātth, āth), [key] — adj. next after the seventh. being one of eight equal parts. —n. an eighth part, esp. of one (). the eighth member of a series. octave. —adv. in the eighth place; eighthly. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: eighth (Thesaurus) Eightfold Way Eighth Amendment Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language