Existing or lasting from the same beginning and having no end; eternal together with something else.
From co- (together) + eternal (from Old French, from Latin aeternalis, from aeternus meaning 'without beginning or end'). Medieval theologians created this term to describe divine attributes sharing eternity.
Christian theologians used 'coeternal' to argue that God the Father and God the Son have always existed together—it was a way to express perfect equality in timelessness.
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