firmament

noun fir·ma·ment \ˈfər-mə-mənt\

: the sky

Full Definition of FIRMAMENT

: the vault or arch of the sky : heavens

obsolete : basis

: the field or sphere of an interest or activity <the international fashion firmament>

— fir·ma·men·tal \ˌfər-mə-ˈmen-t^əl\ adjective

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Middle English, from Late Latin & Latin; Late Latin firmamentum, from Latin, support, from firmare

First Known Use: 13th century

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