The state of sharing eternal existence with something else; existing together through all time without beginning or end.
From coeternal (co- + eternal) + -ity (noun suffix). This philosophical term developed in medieval theology to express the concept of mutual eternality.
The Nicene Creed famously used the concept of coeternity to settle a massive religious argument—declaring that Christ and God share the same eternal existence, not that one came after the other.
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