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firmament

[ fur-muh-muhnt ]
/ ˈfɜr mə mənt /
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noun

the vault of heaven; sky.

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Origin of firmament

1250–1300; Middle English <Late Latin firmāmentum sky, Latin: support, prop, stay, equivalent to firmā(re) to strengthen, support (see firm2) + -mentum-ment
fir·ma·men·tal [fur-muh-men-tl], /ˌfɜr məˈmɛn tl/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for firmament

firmament
/ (ˈfɜːməmənt) /

noun

the expanse of the sky; heavens
firmamental (ˌfɜːməˈmɛntəl), adjective
C13: from Late Latin firmāmentum sky (considered as fixed above the earth), from Latin: prop, support, from firmāre to make firm 1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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