To dissipate is defined as to lessen or disappear, or to cause something to lessen or disappear.(verb)
An example of dissipate is when rain starts to let up or goes away.
See dissipate in Webster's New World College Dictionary
Origin: ME dissipaten < L dissipatus, pp. of dissipare, to scatter < dis-, apart + supare, to throw < IE base *swep- > Sans svapū, broom, LowG swabbeln, to swab
See dissipate in American Heritage Dictionary 4
verb dis·si·pat·ed, dis·si·pat·ing, dis·si·pates verb, transitive
Origin: Middle English dissipaten
Origin: , from Latin dissipāre, dissipāt-.
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