What is the definition of contemporary?

Answer 1

Contemporary means 'present day', or reasonably close. Two individuals are sometimes called contemporaries, meaning that their lives overlapped significantly. The term could be used to indicate that they had similar cultural and social experiences, for example, even if the people never met.
things made during the same time period:

i.e. if two different writers were both writing in the same time frame, their works would be contemporary to one another, in other words, "uncle sam wants you" and "buy war bonds" posters would be considered WWII contemporary.