simultaneous, a.aAr aon uain, comhuaineach, comh-. Simultaneous equation, comhchothromóid f. bSimultaneous with . . ., in éineacht le . ., ar aon uain le . . ., san am céanna le... ►simultaneously, adv.aSan am céanna. bIn éineacht(with, le) . . ., ar aon uain(with, le) ...