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co·eter·nal | \ ˌkō-i-ˈtər-nᵊl 
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\Definition of coeternal
: 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
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Time Traveler for coeternal
The first known use of coeternal was in the 14th century
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