/ Dictionary / Index O on-ramp: Meaning and Definition of Find definitions for: on-ramp Pronunciation: (on'ramp", ôn'-), [key] — n. an entrance lane for traffic from a street to a turnpike or freeway. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ONR on-record Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language