self-possession

from WordNet (r) 3.0 (2006)

self-possession
    n 1: the trait of resolutely controlling your own behavior [syn:
         {self-control}, {self-possession}, {possession},
         {willpower}, {will power}, {self-command}, {self-will}]

from The Collaborative International Dictionary of English v.0.48

Self-possession \Self`-pos*ses"sion\, n.
   The possession of one's powers; calmness; self-command;
   presence of mind; composure.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

35 Moby Thesaurus words for "self-possession":
      aplomb, assurance, ataraxy, balance, calmness, composure,
      confidence, constraint, control, coolness, discipline, equability,
      equanimity, equilibrium, imperturbability, independence,
      level head, levelheadedness, phlegm, poise, possession,
      presence of mind, restraint, sangfroid, self-assurance,
      self-command, self-confidence, self-conquest, self-control,
      self-denial, self-discipline, self-government, self-mastery,
      self-restraint, well-regulated mind