[si.mul.ta.neous] adj [L simul at the same time + E -taneous (as in instantaneous)--more at same] (ca. 1660) 1: existing or occurring at the same time: exactly coincident
2: satisfied by the same values of the variables "~ equations" syn see contemporary -- si.mul.ta.ne.ity n -- si.mul.ta.neous.ly adv -- si.mul.ta.neous.ness n