/ Dictionary / Index D Duncan I: Meaning and Definition of Find definitions for: Duncan I Pronunciation: [key] died 1040, king of Scotland 1030–40: murdered by Macbeth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Duncan Duncan Phyfe Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language