Webster's English Dictionary

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firmament

fir.ma.ment \'f*r-m*-m*nt\ \.f*r-m*-'ment-*l\ n [MF, fr. LL & L; LL 
   firmamentum, fr. L, support, fr. firmare] 1: the vault or arch of the sky : 
   HEAVENS  obs  2: BASIS  - fir.ma.men.tal aj