/ Dictionary / Index E eighty-sixth: Meaning and Definition of Find definitions for: eight•y-sixth Pronunciation: (ā'tē siksth'), [key] — adj. next after the eighty-fifth; being the ordinal number for 86. being one of 86 equal parts. —n. an eighty-sixth part, esp. of one (). the eighty-sixth member of a series. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. eighty-six eighty-third Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language