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The Collaborative International Dictionary of English v.0.48 (gcide)

resilience \re*sil"i*ence\ (r[-e]*z[i^]l"[i^]*ens), resiliency
\re*sil"i*en*cy\ (r[-e]*z[i^]l"[i^]*en*s[y^]), 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]


Elasticity \E`las*tic"i*ty\ ([=e]`l[a^]s*t[i^]s"[i^]*t[y^]), n.
[Cf. F. ['e]lasticit['e].]
1. The quality of being elastic; the inherent property in
bodies by which they recover their former figure or
dimensions, after the removal of external pressure or
altering force; springiness; resilience; tendency to
rebound; as, the elasticity of caoutchouc; the elasticity
of the air.
[1913 Webster]

2. Power of resistance to, or recovery from, depression or
overwork; -- usually referred to as {resilience}[3].
[1913 Webster]

{Coefficient of elasticity}, the quotient of a stress (of a
given kind), by the strain (of a given kind) which it
produces; -- called also {coefficient of resistance}.

{Surface of elasticity} (Geom.), the pedal surface of an
ellipsoid (see {Pedal}); a surface used in explaining the
phenomena of double refraction and their relation to the
elastic force of the luminous ether in crystalline media.
[1913 Webster]