Firmament /(?)/

Fir·ma·ment

Firmament

n.
  1. Fixed foundation; established basis. [Obs.]
    Custom is the . . . firmament of the law.
  2. The region of the air; the sky or heavens.
    And God said, Let there be a firmament in the midst of the waters, and let it divide the waters from the waters.
    — Gen. i. 6.
    And God said, Let there be lights in the firmament.
    — Gen. i. 14.
  3. The orb of the fixed stars; the most remote of the celestial spheres. (Old Astron.)