MonPronunciation: /mɔːn/Definition of Mon noun (plural same or Mons) 1a member of a people now inhabiting parts of SE Burma (Myanmar) and western Thailand but having their ancient capital at Pegu in the south of Burma. 2 [mass noun] the language of the Mon, related to Khmer (Cambodian). adjective relating to the Mon or their language. See also Mon-Khmer.Origin:the name in MonMon in other Oxford dictionaries Definition of Mon in the US English dictionary