[adjective] [formal]A reciprocal action or arrangement involves two people or groups of people who behave in the same way or agree to help each other and give each other advantages.The two superpowers agreed to a reciprocal reduction of nuclear weapons.Many states have passed laws that will allow nationwide reciprocal banking.
Meaning of RECIPROCAL in English
Cambridge English vocab. Кембриджский английский словарь. 2012