Of the same age; having lived for an equal period.Existing from the same point of time; coincident in duration: followed by with, sometimes by to.Coincident in time; contemporary; synchronous: followed by with.Synonyms Coeval, Contemporaneous. Coeval is more commonly applied to things, contemporaneous to persons; but the distinction is not a rigid one.n. One of the same age or period; a contemporary in age or active existence.