The Collaborative International Dictionary of English v.0.48:

Tumultuation \Tu*mul`tu*a"tion\
   (t[-u]*m[u^]l`t[-u]*[=a]"sh[u^]n), n. [L. tumultuatio.]
   Irregular or disorderly movement; commotion; as, the
   tumultuation of the parts of a fluid. [Obs.] --Boyle.
   [1913 Webster]