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The Collaborative International Dictionary of English v.0.48 (gcide)

Dissipate \Dis"si*pate\, v. i.
1. To separate into parts and disappear; to waste away; to
scatter; to disperse; to vanish; as, a fog or cloud
gradually dissipates before the rays or heat of the sun;
the heat of a body dissipates.
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2. To be extravagant, wasteful, or dissolute in the pursuit
of pleasure; to engage in dissipation.
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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.
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Dissipated those foggy mists of error. --Selden.
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I soon dissipated his fears. --Cook.
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The extreme tendency of civilization is to dissipate
all intellectual energy. --Hazlitt.
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2. To destroy by wasteful extravagance or lavish use; to
squander.
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The vast wealth . . . was in three years dissipated.
--Bp. Burnet.

Syn: To disperse; scatter; dispel; spend; squander; waste;
consume; lavish.
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