The quality of being of the same age or existing at the same time as something else.
From coeval (Latin coaevus) + -ity (noun suffix). The suffix -ity converts the adjective into an abstract noun expressing the state of coexisting in time.
Geologists studying climate change look at the coevality of ice cores and tree rings to verify they're examining the same period of Earth's history—synchronizing evidence like a temporal fingerprint.
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