n.
Pronunciation: ' f ə r-m ə -m ə nt
Function: noun
Etymology: Middle English, from Late Latin & Latin; Late Latin firmamentum, from Latin, support, from firmare
Date: 13th century
1 : the vault or arch of the sky : HEAVENS
2 obsolete : BASIS
3 : the field or sphere of an interest or activity <the international fashion firmament >
– fir · ma · men · tal \ ˌ f ə r-m ə - ' men-t ə l \ adjective