Synonyms for Poise (same or very similar meaning)
WordNet sense 1 (great coolness and composure under strain):
aplomb, cool, assuredness, sang-froidWordNet sense 2 (prepare (oneself) for something unpleasant or difficult):
braceWordNet sense 3 (hold or carry in equilibrium):
balanceFrom the ODE community, based on WordNetadd/edit