1. The sky viewed originally as a solid expanse with stars fixed in it.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• fillament,
• permament,
• firnament,
• firment,
• firemament,
• firament,
• ormament,
• fimament,
• dirmament,
• cirmament,
• virmament,
• girmament,
• tirmament,
• formament,
• fiermament,
• firmamentel,
• fortamente,
• formemint,
• Formement,
• fermament

• firmamental,
• Firmin,
• fireman,
• fairman,
• Firman.

The adjective form of the word "firmament" is "firmamental".

The plural of the "firmament" can be the "firmaments".

The singular of the "firmament" can be the "firmament".