/ Dictionary / Index G galaxy: Meaning and Definition of Find definitions for: gal•ax•y Pronunciation: (gal'uk-sē), [key] — pl. -ax•ies. a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. (usually cap.) SeeMilky Way. any large and brilliant or impressive assemblage of persons or things: a galaxy of opera stars. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: galaxy (Thesaurus) galax Galba Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language