adj. 1 heavenly; divinely good or beautiful; sublime. 2 a of the sky; of the part of the sky commonly observed in astronomy etc. b of heavenly bodies. celestial equator the great circle of the sky in the plane perpendicular to the earth's axis. celestial horizon see HORIZON 1c. celestial navigation navigation by the stars etc. celestially adv.
[ ME f. OF f. med.L caelestialis f. L caelestis: see CELESTE ]