The Collaborative International Dictionary of English v.0.48:
Springiness \Spring"i*ness\ (-[i^]*n[e^]s), n. The state or quality of being springy. --Boyle. [1913 Webster]WordNet (r) 3.0 (2006):
springiness n 1: the elasticity of something that can be stretched and returns to its original length [syn: give, spring, springiness]