Breadcrumb Home > 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: ultimathule Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language