Noah Webster
Contemporary
CONTEMPORARY, adjective [Latin , time. For the sake of easier pronunciation and a ore agreeable sound, this word is often changed to cotemporary.] Coetaneous; living at the same time, applied to persons; being or existing at the same time, applied to things; as contemporary kings; contemporary events. [See Cotemporary, the preferable word.]
CONTEMPORARY, noun One who lives at the same time with another.
Socrates and Plato were contemporaries.