Definition of firmament noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈfɜːməmənt//
; NAmE NAmE//ˈfɜːrməmənt//
the firmament [singular] (old use or literary) Sky
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the sky (figurative) a rising star in the literary firmament See related entries: Sky Word OriginMiddle English: via Old French from Latin firmamentum, from firmare ‘fix, settle’.
See the Oxford Advanced American Dictionary entry: firmament