Living or existing at the same time; of the same age or era.
From Latin coaetaneus, from co- (together) + aetaneus (relating to aetas, 'age'). This is an older English variant of coetanean with the same meaning and origin.
If you're coetaneous with someone, you're literally neighbors in time—Cleopatra and Julius Caesar were coetaneous, which is why their meeting was such a big historical deal.
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