/ Dictionary / Index M murder one: Meaning and Definition of Find definitions for: mur'der one' Pronunciation: [key] first-degree murder. See under(def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Murder in the Cathedral* murderous Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language