Breadcrumb Home > Dictionary > Index P pronto: Meaning and Definition of Find definitions for: pron•to Pronunciation: (pron'tō), [key] — adv. Informal. promptly; quickly. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pronto (Thesaurus) pronouncement pronuclear ✖ Related Content Daily Word Quiz: musth Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language