Source : Webster's Revised Unabridged Dictionary (1913)

Cotemporary \Co*tem"po*ra*ry\ (k?-t?m"p?-r?-r?), a.
   Living or being at the same time; contemporary.

Cotemporary \Co*tem"po*ra*ry\, n.; pl. {Cotemporaries}
   (-r[i^]z).
   One who lives at the same time with another; a contemporary.