"treaty country"

in relation to any provision of this Act, means the Republic and any country, including any colony, protectorate or territory subject to the authority or under suzerainty of such country or any territory over which a mandate or trusteeship is exercised by such country, which is a party to any bilateral treaty or agreement entered into by the Republic in connection with any matter dealt with in such provision;

[Definition inserted by section 31(f) of Act No. 69 of 1962]