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  • Definition
    • firmament : The vault of the heavens, where the clouds, sun, moon, and stars can be seen; the heavens, the sky.

      • firmament : The field or sphere of an activity or interest.

        • firmament : In the geocentric Ptolemaic system, the eighth celestial sphere which carried the fixed stars; any celestial sphere.

          • firmament : The abode of God and the angels; heaven.

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          • Derivative