/ Dictionary / Index F firstnighter: Meaning and Definition of Find definitions for: first•night•er Pronunciation: (fûrst'nī'tur), [key] — n. a person who often or usually attends the theater, opera, etc., on opening night. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. first night first offender Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language