Source : Webster's Revised Unabridged Dictionary (1913)

Wichitas \Wich"i*tas\, n. pl.; sing. {Wichita}. (Ethnol.)
   A tribe of Indians native of the region between the Arkansas
   and Red rivers. They are related to the Pawnees. See
   {Pawnees}.

Source : WordNet®

Wichita
     n 1: a member of the Caddo people formerly living between Kansas
          and central Texas
     2: the largest city in Kansas; located in southern Kansas on
        the Arkansas River
     3: the Caddoan language spoken by the Wichita people