Breadcrumb Home > Dictionary > Index N nightie: Meaning and Definition of Find definitions for: night•ie Pronunciation: (nī'tē), [key] — n. Informal. a nightgown. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nightie (Thesaurus) night heron nightingale ✖ Related Content Daily Word Quiz: tendentious Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language