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.] [1913 Webster]

Custom is the . . . firmament of the law. --Jer. Taylor. [1913 Webster]

2. The region of the air; the sky or heavens. [1913 Webster]

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. [1913 Webster]

And God said, Let there be lights in the firmament. --Gen. i. 14. [1913 Webster]

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. [1913 Webster]

3. (Old Astron.) The orb of the fixed stars; the most rmote of the celestial spheres. [1913 Webster]

The Collaborative International Dictionary of English. 2000.