Abbreviated "MFN", it's the clause in an international trade agreement that grants signatory countries the same tariff rate
Of the original 
GATT... [DOC] [TLE] Most-Favored-Nation (Normal-Trade-Relations) Policy of the United ... [PAR] MFN tariff status, however, can be restored to and retained temporarily by most of 
... with the United States a trade agreement, containing a reciprocal MFN clause, 
... and because of its continued universal use in international trade relations as 
well ... the application of MFN tariff rates to the Soviet Union and of all countries 
or... [DOC] [TLE] Most Favored Nation Clause Definition | Investopedia [PAR] A country grants this clause to another nation if it is interested in increasing trade 
... are given specific trade advantages such as reduced tariffs on imported goods.