/ Dictionary / Index N numero uno: Meaning and Definition of Find definitions for: nu•me•ro u•no Pronunciation: (n'mu-rō" 'nō, ny'-), [key] number one (defs. 1–4). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. numerology numerous 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