FonPronunciation: /fɒn/Definition of Fon noun (plural same or Fons) 1a member of a people inhabiting the southern part of Benin. 2 [mass noun] the language of the Fon, belonging to the Kwa group, with about 1 million speakers. adjective relating to the Fon or their language. Origin:the name in FonFon in other Oxford dictionaries Definition of Fon in the US English dictionary