resiliency

noun

1. The ability to recover quickly from depression or discouragement: bounce, buoyancy, elasticity, resilience. See ability/inability.
2. The quality or state of being flexible: bounce, ductility, elasticity, flexibility, flexibleness, give, malleability, malleableness, plasticity, pliability, pliableness, pliancy, pliantness, resilience, spring, springiness, suppleness. Obsolete flexure. See flexible/rigid.

The noun has 2 meanings:

Meaning #1: an occurrence of rebounding or springing back
  Synonym: resilience

Meaning #2: the physical property of a material that can return to its original shape or position after deformation that does not exceed its elastic limit
  Synonym: resilience