synchronous

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>.