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Adjective: most-favored-nation
Usage: US (elsewhere: most-favoured-nation)
  1. Of or relating to a commercial treaty where two nations agree to accord each other the same favorable terms that would be offered in treaties with any other nation
    "The most-favored-nation clause ensured equal trade benefits";
    - most-favoured-nation [Brit, Cdn]

Encyclopedia: Most-favored-nation