FIRMAMENT
Etymology
Noun
firmament (countable and uncountable, plural firmaments)
(usually, uncountable, literary, poetic, also, figuratively) The vault of the heavens, where the clouds, sun, moon, and stars can be seen; the heavens, the sky.
Synonyms: lift (Britain, dialectal), welkin (poetic, archaic)
(countable) The field or sphere of an activity or interest.
(uncountable, astronomy, historical) In the geocentric Ptolemaic system, the eighth celestial sphere which carried the fixed stars; (countable, by extension) any celestial sphere.
(uncountable, obsolete, except, biblical) The abode of God and the angels; heaven.
(countable, obsolete) A piece of jewellery worn in a headdress with numerous gems resembling stars in the sky.
(countable, obsolete, also, figuratively) A basis or foundation; a thing which lends strength or support.
(countable, obsolete) The act or process of making firm or strengthening.
Notes
Source: Wiktionary
Fir"ma*ment, n. Etym: [L. firmamentum, fr. firmare to make firm: cf.
F. firmament. See Firm, v. & a.]
1. Fixed foundation; established basis. [Obs.]
Custom is the . . . firmament of the law. Jer. Taylor.
2. The region of the air; the sky or heavens.
And God said, Let there be a firmament in the miGen. i. 6.
And God said, Let there be lights in the firmament. Gen. i. 14.
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.
3. (Old Astron.)
Definition: The orb of the fixed stars; the most rmote of the celestial
spheres.
Source: Webster’s Unabridged Dictionary 1913 Edition