/ Dictionary / Index N nonpeak: Meaning and Definition of Find definitions for: non•peak Pronunciation: (non-pēk'), [key] — adj. off-peak. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nonpayment nonperformance Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language