simultaneous

/ˌsī-məl-ˈtā-nē-əs/

borrowed from Medieval Latin simultāneus "occurring at the same time," from Latin simul "in company, together, at the same time" (going back to an apocopated neuter form of similis "having characteristics in common, like") + Medieval Latin -tāneus, as in instantāneus instantaneousmomentāneus "momentary," spontāneus "voluntary, unconstrained, spontaneous

adjective

  1. existing or occurring at the same time : exactly, coincident

  2. satisfied by the same values of the variables

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. contemporaneous is more often applied to events than to people.