The Collaborative International Dictionary of English v.0.48:
dissipate \dis"si*pate\ (d[i^]s"s[i^]*p[=a]t), v. t. [imp. & p.
p. Dissipated; p. pr. & vb. n. Dissipating.] [L.
dissipatus, p. p. of dissipare; dis- + an obsolete verb
sipare, supare. to throw.]
1. To scatter completely; to disperse and cause to disappear;
-- used esp. of the dispersion of things that can never
again be collected or restored.
Dissipated those foggy mists of error. --Selden.
I soon dissipated his fears. --Cook.
The extreme tendency of civilization is to dissipate
all intellectual energy. --Hazlitt.
2. To destroy by wasteful extravagance or lavish use; to
The vast wealth . . . was in three years dissipated.
Syn: To disperse; scatter; dispel; spend; squander; waste;