The Collaborative International Dictionary of English v.0.48:

Assamese \As`sam*ese"\, a.
   Of or pertaining to Assam, a province of British India, or to
   its inhabitants. -- n. sing. & pl. A native or natives of
   Assam.
   [1913 Webster] Assapan

WordNet (r) 3.0 (2006):

Assamese
    adj 1: of or relating to or characteristic of Assam or its
           people or culture or language
    n 1: native or inhabitant of the state of Assam in northeastern
         India
    2: the Magadhan language spoken by the Assamese people; closely
       related to Bengali [syn: Assamese, Asamiya]