firmament

mastery
UK /ˈfɜːməm(ə)nt/ US /ˈfɝməmənt/noun

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What does 'firmament' mean in this sentence?

Pins tipt with Diamond Point, and head, / By which the Curls are faſtened, / In radiant Firmament ſet out, / And all over the Hood ſur-tout: [...]