self-possession (n.)

• aplomb
• assurance
• balance
• calmness
• composure
• confidence
• constraint
• control
• coolness
• discipline
• equanimity
• equilibrium
• imperturbability
• independence
• phlegm
• poise
• possession
• restraint
• self-assurance
• self-command
• self-confidence
• self-control
• self-denial
• self-discipline
• self-government
• self-restraint