Русско-англо-русский юридический словарь

The law of agency is an area of commercial law dealing with a set of contractual, quasi-contractual and non-contractual fiduciary relationships that involve a person, called the agent, that is authorized to act on behalf of another (called the principal) to create legal relations with a third party. (Wikipedia)

The law of agency in South Africa regulates the performance of a juristic act on behalf or in the name of one person ("the principal") by another ("the agent"), who is authorised by the principal to act, with the result that a legal tie (vinculum juris) arises between the principal and a third party, which creates, alters or discharges legal relations between the principal and a third party. (Wikipedia)