Словарь синонимов английского языка - prerequisite

(adj) 1. essential, necessary, requisite, imperative, indispensable, obligatory, required, called-for, demanded: Naval service is a prerequisite condition for joining the club. -(n) 2. precondition, requirement, qualification, requisite, condition, sine qua non, proviso, provision, necessity: A thorough grounding in mathematics is a prerequisite for the study of advanced physics.