Breadcrumb Home > Dictionary > Index N night-night: Meaning and Definition of Find definitions for: night-night Pronunciation: (interj.nīt'nīt', -nīt"adv.nīt'nīt"), [key] — interj. good night. —adv. to go to bed or to sleep. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. night monkey night office ✖ Related Content Daily Word Quiz: hortatory Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language