/ Dictionary / Index N night owl: Meaning and Definition of Find definitions for: night' owl" Pronunciation: [key] — Informal. Informal. a person who often stays up late at night; nighthawk. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. night office night person Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language