Elasticity \E`las*tic"i*ty\, 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; tendency to rebound; as, the elasticity of caoutchouc; the elasticity of the air.

2. Power of resistance to, or recovery from, depression or overwork.

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.

Source: Webster's Revised Unabridged Dictionary (1913)