firmament
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fir·ma·ment

noun \ˈfər-mə-mənt\

Definition of FIRMAMENT

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 \ˌfər-mə-ˈmen-təl\ adjective

Examples of FIRMAMENT

  1. meteors flashing across the firmament
  2. <the stars in the firmament twinkled ever so brightly>

Origin of FIRMAMENT

Middle English, from Late Latin & Latin; Late Latin firmamentum, from Latin, support, from firmare
First Known Use: 13th century

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