firmament
noun
fir·ma·ment
ˈfər-mə-mənt
1
: the vault or arch of the sky : heavens
Stars twinkled in the firmament.
2
obsolete
: basis
3
: the field or sphere of an interest or activity
the international fashion firmament
She's a rising star in the city's artistic firmament.
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Merriam-Webster unabridged
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