/ Dictionary / Index M major key: Meaning and Definition of Find definitions for: ma'jor key' Pronunciation: [key] a key whose essential harmony is based on the major scale. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. majority leader major league Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language