| Firmament 1. (v. & a.) Fixed foundation; established basis. 2. (v. & a.) The region of the air; the sky or heavens. 3. (v. & a.) The orb of the fixed stars; the most remote of the celestial spheres. Thesaurus Entries Caelus, air, azure, blue sky, caelum, canopy, canopy of heaven, cerulean, cope, empyrean, ether, heaven, heavens, hyaline, lift, lifts, sky, starry heaven, the blue, the blue serene, vault, vault of heaven, welkin |