/ Dictionary / Index A augmented sixth: Meaning and Definition of Find definitions for: augment'ed sixth' Pronunciation: [key] — Music. Music. an interval greater than a major sixth by a chromatic half step. any of various chords having this as the characteristic interval. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. augmented roman augmenter Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language