Definitions
1.NounThe vault of the heavens, where the clouds, sun, moon, and stars can be seen; the heavens, the sky.
2.NounThe field or sphere of an activity or interest."the international fashion firmament"
3.NounIn the geocentric Ptolemaic system, the eighth celestial sphere which carried the fixed stars; any celestial sphere.
4.NounThe abode of God and the angels; heaven.
5.NounA piece of jewellery worn in a headdress with numerous gems resembling stars in the sky.
6.NounA basis or foundation; a support.
7.NounThe act or process of making firm or strengthening.