The Collaborative International Dictionary of English v.0.48:

Self-determination \Self`-de*ter`mi*na"tion\, n.
   Determination by one's self; or, determination of one's acts
   or states without the necessitating force of motives; --
   applied to the voluntary or activity.
   [1913 Webster]

WordNet (r) 3.0 (2006):

self-determination
    n 1: government of a political unit by its own people [syn:
         self-government, self-determination, self-rule]
    2: determination of one's own fate or course of action without
       compulsion