/ Dictionary / Index N nocturnal emission: Meaning and Definition of Find definitions for: noctur'nal emis'sion Pronunciation: [key] the release of semen during sleep, often during a sexual dream. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nocturnal arc nocturne Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language