/ Dictionary / Index M metagalaxy: Meaning and Definition of Find definitions for: met•a•gal•ax•y Pronunciation: (met"u-gal'uk-sē), [key] — pl. -ax•ies. the complete system of galaxies; the Milky Way and all the surrounding galaxies. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. metafiction metage Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language