/ Dictionary / Index C celestial equator: Meaning and Definition of Find definitions for: celes'tial equa'tor Pronunciation: [key] — Astron., Navig. Astron.,Navig. the great circle of the celestial sphere, lying in the same plane as the earth's equator. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Celestial Empire celestial globe Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language