simultaneous

contemporary, contemporaneous, coeval, synchronous, simultaneous, coincident mean existing or occurring at the same time. contemporary is likely to apply to people and what relates to them.

• • Abraham Lincoln was contemporary with Charles Darwin

contemporaneous is more often applied to events than to people.

• • contemporaneous accounts of the kidnapping

coeval refers usually to periods, ages, eras, eons.

• • two stars thought to be coeval

synchronous implies exact correspondence in time and especially in periodic intervals.

• • synchronous timepieces

simultaneous implies correspondence in a moment of time.

• • the two shots were simultaneous

coincident is applied to events and may be used in order to avoid implication of causal relationship.

• • the end of World War II was coincident with a great vintage year