verb (used with object), dissipated, dissipating.
to scatter in various directions; disperse; dispel.
to spend or use wastefully or extravagantly; squander; deplete: to dissipate one's talents; to dissipate a fortune on high living.
verb (used without object), dissipated, dissipating.
to become scattered or dispersed; be dispelled; disintegrate: The sun shone and the mist dissipated.
to indulge in extravagant, intemperate, or dissolute pleasure.

1525–35; < Latin dissipātus (past participle of dissipāre, dissupāre to scatter); see -ate1

dissipater, dissipator, noun
dissipative, adjective
dissipativity [dis-uh-puh-tiv-i-tee] , noun
nondissipative, adjective

1. See scatter. 3. disappear, vanish.

1, 3. unite.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dissipate (ˈdɪsɪˌpeɪt)
1.  to exhaust or be exhausted by dispersion
2.  (tr) to scatter or break up
3.  (intr) to indulge in the pursuit of pleasure
[C15: from Latin dissipāre to disperse, from dis-1 + supāre to throw]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1530s, from L. dissipatus, pp. of dissipare "disperse, squander, disintegrate," from dis- "apart" + supare "to throw, scatter." Related: Dissipated; dissipates; dissipating.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
There is a simple rule of thumb that can be applied toward multiple solutions:
  don't expend energy in order to dissipate energy.
It will probably make the pain dissipate faster.
First of all, tornadoes go through changes before they dissipate.
Ranchers' historic animosity toward a predator like the jaguar doesn't
  dissipate easily.
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