The Collaborative International Dictionary of English v.0.48:
Spasticity \Spas*tic"i*ty\, n. 1. A state of spasm. [1913 Webster] 2. The tendency to, or capability of suffering, spasm. [1913 Webster]WordNet (r) 3.0 (2006):
spasticity n 1: the quality of moving or acting in spasms