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English definition of “the firmament”

the firmament

noun [S]     /ˈfɜː.mə.mənt/ US  /ˈfɜːr-/ literary
the sky: figurative She is one of the rising stars in the political firmament.The Earth and outer space - general words
(Definition of the firmament noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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