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Definition of firmament:

  1. Fixed foundation; established basis.
  2. The orb of the fixed stars; the most rmote of the celestial spheres.
  3. The region of the air; the sky or heavens.


sphere of influence, vault of heaven, air, domain, heavens, sky, high, field, arena, welkin, heaven, orbit, celestial sphere, area, sector, sky, heaven, atmosphere, sphere, empyrean.

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