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The Collaborative International Dictionary of English v.0.48 (gcide)

Firmament \Fir"ma*ment\, n. [L. firmamentum, fr. firmare to make
firm: cf. F. firmament. See {Firm}, v. & a.]
1. Fixed foundation; established basis. [Obs.]
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Custom is the . . . firmament of the law. --Jer.
Taylor.
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2. The region of the air; the sky or heavens.
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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.
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And God said, Let there be lights in the firmament.
--Gen. i. 14.
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Note: In Scripture, the word denotes an expanse, a wide
extent; the great arch or expanse over out heads, in
which are placed the atmosphere and the clouds, and in
which the stars appear to be placed, and are really
seen.
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3. (Old Astron.) The orb of the fixed stars; the most remote
of the celestial spheres.
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