The Collaborative International Dictionary of English v.0.48:

Self-control \Self`-con*trol"\, n.
   Control of one's self; restraint exercised over one's self;
   self-command.
   [1913 Webster]

WordNet (r) 3.0 (2006):

self-control
    n 1: the act of denying yourself; controlling your impulses
         [syn: self-denial, self-discipline, self-control]
    2: the trait of resolutely controlling your own behavior [syn:
       self-control, self-possession, possession, willpower,
       will power, self-command, self-will]