Abbreviated "MFN", it's the clause in an international trade agreement that grants signatory countries the same tariff rate
... member is defined in section 2(10) of the Uruguay Round Agreements Act as 
a .... nation grants promiscuously to the subjects of foreign powers or countries,... [DOC] [TLE] Most favoured nation clause - Expand Your Mind - Revolvy [PAR] In the early days of international trade, "most favoured nation" status was ... A 
country that grants MFN on imports will have its imports provided by the most ... 
the members while maintaining tariff walls between member nations and the rest 
of the world.