/ Dictionary / Index G galactic coordinates: Meaning and Definition of Find definitions for: galac'tic coor'dinates Pronunciation: [key] — Astron. Astron. a system of coordinates utilizing galactic latitude and galactic longitude to define the position of a celestial body with reference to the Milky Way. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. galactic cluster galactic equator Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language