/ Dictionary / Index O onliest: Meaning and Definition of Find definitions for: on•li•est Pronunciation: (ōn'lē-ist), [key] — adj. Nonstandard. only: used as an intensive. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. On Liberty* on-limits Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language