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The vault or expanse of the heavens; the sky.

[Middle English, from Old French, from Late Latin firmāmentum, from Latin, support, from firmāre, to strengthen; see firm2.]

fir′ma·ment′al (-mĕn′tl) adj.
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Adj.1.firmamental - relating to the firmament or upper regions
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References in periodicals archive ?
By the absolute equalization of this movement--or of such as this--had the cycles of the firmamental orbs themselves, been adjusted.
After a few volleys of this firmamental artillery a large cloud was seen coming down from the direction of Sterling North, and its approach was heralded by a strange noise similar to the distant roar of a stormy sea.
Contemplating the cleanness of unspeaking lips and unseeing eyes ("ce regard firmamental," "cette bouche d'astralite" [110]), Lucien knows the highest vision is the one he cannot capture: "ma main," he says, "s'est refusee a peindre ce que je ressentais, ce que je comprenais d'interieur" (110).