The Collaborative International Dictionary of English v.0.48:

Mahratta \Mah*rat"ta\, n. [Hind. Marhat[=a], Marh[=a]tt[=a], the
   name of a famous Hindoo race, from the old Skr. name
   Mah[=a]-r[=a]shtra.]
   One of a numerous people inhabiting the southwestern part of
   India. Also, the language of the Mahrattas; Mahrati. It is
   closely allied to Sanskrit. -- a. Of or pertaining to the
   Mahrattas. [Written also Maratha.]
   [1913 Webster] Mahumetan

WordNet (r) 3.0 (2006):

Maratha
    n 1: a member of a people of India living in Maharashtra [syn:
         Maratha, Mahratta]