coeternal
adjective
co·eter·nal
ˌkō-i-ˈtər-nᵊl
: equally or jointly eternal
… the old 19th-century view that … if life and matter are coeternal, there is no problem of the origin of life to be figured out.—Carl Sagan
coeternally
adverb
existing coeternally
coeternity
noun
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Merriam-Webster unabridged
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