Source : Webster's Revised Unabridged Dictionary (1913)

Resilience \Re*sil"i*ence\ (r?-z?l"?-ens), Resiliency
\Re*sil"i*en*cy\ (-en-s?), n.
   1. The act of resiling, springing back, or rebounding; as,
      the resilience of a ball or of sound.

   2. (Mech. & Engyn.) 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.

Source : WordNet®

resilience
     n 1: the physical property of a material that can return to its
          original shape or position after deformation that does
          not exceed its elastic limit [syn: {resiliency}]
     2: an occurrence of rebounding or springing back [syn: {resiliency}]