The Collaborative International Dictionary of English v.0.48:

Pawnee \Pawn*ee"\, n. (Law)
   One or two whom a pledge is delivered as security; one who
   takes anything in pawn.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pawnees \Paw`nees"\, prop. n. pl.; sing. Pawnee. (Ethnol.)
   A tribe of Indians (called also Loups) who formerly
   occupied the region of the Platte river, but now (1890) live
   mostly in the Indian Territory (Oklahoma). The term is often
   used in a wider sense to include also the related tribes of
   Rickarees and Wichitas. Called also Pani.
   [1913 Webster] Pawner

WordNet (r) 3.0 (2006):

Pawnee
    n 1: a member of the Pawnee nation formerly living in Nebraska
         and Kansas but now largely in Oklahoma
    2: the Caddoan language spoken by the Pawnee