Cotemporal means existing or occurring during the same time period, but there are several synonyms that can be used in its place. These include contemporaneous, coeval, synchronous, concurrent, and concurrential. Contemporaneous is perhaps the most commonly used synonym, and means existing or occurring during the same period of time. Coeval is a more literary synonym and refers to things or people that are of the same age or period. Synchronous is a technical term used in fields such as computing and electronics to describe events that occur at the same time. Concurrent and concurrential both mean happening at the same time, but the latter is a more rare and archaic term.