|n.||1.||Fixed foundation; established basis.|
|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.
|3.||(Old Astron.) The orb of the fixed stars; the most rmote of the celestial spheres.|
|Noun||1.||firmament - the apparent surface of the imaginary sphere on which celestial bodies appear to be projected|