Русско-англо-русский юридический словарь

A permanent contract is the most common type of employment, an indefinite contract whereby you are employed by the company until such time as the employer or the employee no longer wish to work there. (be a londoner)

A permanent contract (also called indefinite contract) is a contract with no expiration date, which remains valid until either employer or employee chooses to end the agreement. (UNESCO UIS)