What is the meaning of poise?

noun

• A cgs unit of dynamic viscosity equal to one dyne-second per square centimeter; the viscosity of a fluid in which a force of one dyne per square centimeter maintains a velocity of 1 centimeter per second.
• A state of being balanced in a stable equilibrium.
• Great coolness and composure under strain.
  • usage: "keep your cool"
  • synonyms: aplomb, assuredness, cool, sang-froid

verb

• Be motionless, in suspension.
  • usage: "The bird poised for a few moments before it attacked"
• Prepare (oneself) for something unpleasant or difficult.
  • synonyms: brace
• Cause to be balanced or suspended.
• Hold or carry in equilibrium.
  • synonyms: balance