contemporaneous (adj.)

1630s, "occurring, living, or existing at the same time, belonging to the same age or period," from Medieval Latin contemporarius, from assimilated form of Latin com "with, together" (see con-) + temporarius "of time," from tempus "time, season, portion of time" (see temporal (adj.)). Form cotemporary was common in 18c. Meaning "modern, characteristic of the present" (in reference to art, literature, etc.) is from 1805.

"state or quality of being contemporaneous," 1772; see contemporaneous + -ity.