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
In general, deeper earthquakes are less damaging because their energy
  dissipates before it reaches the surface.
Much of the resistance to improving their working conditions, especially from
  tenure-track faculty members, dissipates.
Add at the end of cooking, as heat dissipates flavor and aroma.
In each case, some of the tension between each pair dissipates by the end of
  the first episode.
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