Yuma2 Syllabification: (Yu·ma)Pronunciation: /ˈyo͞omə/Definition of Yuma noun 1 (plural same or Yumas) a member of an American Indian people living mainly in southwestern Arizona. 2the Yuman language of the Yumas. adjective relating to the Yuma. Origin:from Pima yumĭYuma in other Oxford dictionaries Definition of Yuma in the British & World English dictionary