NahuatlPronunciation: /ˈnɑːwɑːt(ə)l, nɑːˈwɑːt(ə)l/Definition of Nahuatl noun (plural same or Nahuatls) 1a member of a group of peoples native to southern Mexico and Central America, including the Aztecs. 2 [mass noun] the Uto-Aztecan language of the Nahuatl, which has over 1 million speakers. adjective relating to the Nahuatl or their language. Origin:via Spanish from NahuatlNahuatl in other Oxford dictionaries Definition of Nahuatl in the US English dictionary