/ Dictionary / Index N nighty: Meaning and Definition of Find definitions for: night•y Pronunciation: (nī'tē), [key] — pl. night•ies. nightie. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nightwear nighty-night Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language