What word describes someone or something that belongs to the same period of time as oneself?

The word "contemporary" appropriately describes someone or something that exists or belongs to the same time period as another. It is often used in cultural contexts to refer to artists, writers, or even styles that are relevant to the present time or a specific historical moment shared by two or more subjects. For instance, contemporary art relates to art produced in the late 20th and early 21st century, reflecting the current societal themes and ideas of that time.

In contrast, "historic" generally pertains to something significant in history or something that has enduring importance, which does not necessarily indicate a relationship of shared time. "Simultaneous" suggests that events or actions occur at the same time, but it lacks the emphasis on belonging to a particular time frame that “contemporary” conveys. "Peer" refers to a person who is equal in age, status, or ability, and while it does imply a relationship, it does not intrinsically relate to time periods. Therefore, "contemporary" is the word that best encapsulates the idea of belonging to the same period.