{ } n. 1. The act of springing back, rebounding, or resiling; as, the resilience of a ball or of sound. [ 1913 Webster ]

2. The power or inherent property of returning to the form from which a substance is bent, stretched, compressed, or twisted; elasticity[ 1 ]; springiness; -- of objects and substances. [ PJC ]

3. Hence: The power or ability to recover quickly from a setback, depression, illness, overwork or other adversity; buoyancy; elasticity[ 2 ]; -- of people. [ PJC ]

4. (Mech. & Engin.) The mechanical work required to strain an elastic body, as a deflected beam, stretched spring, etc., to the elastic limit; also, the work performed by the body in recovering from such strain. [ 1913 Webster ]