Of the same age or time period; existing or happening at the same time.
From Latin coaevus, from co- (together) + aevum (age or lifetime). This term has been used in English since the 17th century to describe things of equal antiquity.
Fossils that are coeval tell us about the same moment in Earth's history—so if you find two fossils together and they're coeval, you know an ancient ecosystem is being revealed.
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