/ Dictionary / Index O oldest: Meaning and Definition of Find definitions for: old•est Pronunciation: (ōl'dist), [key] — adj. a superlative of Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oldest (Thesaurus) older Old Faithful Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language