01 n. Fixed foundation; established basis.
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1.
Fixed foundation; established basis.[Obs.]“Custom is the . . . firmament of the law.” — Jer. Taylor.
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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.
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3.
The orb of the fixed stars; the most remote of the celestial spheres.(Old Astron.)