/ Dictionary / Index O one-to-one: Meaning and Definition of Find definitions for: one-to-one Pronunciation: (wun'tu-wun'), [key] — adj. (of the relationship between two or more groups of things) corresponding element by element. one-on-one. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: one-to-one (Thesaurus) one-time one-track 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