/ ˌdɪsɪˈpeɪʃn; NAmE / noun [ U ] ( formal )
1.
the process of disappearing or of making sth disappear :
the dissipation of energy in the form of heat
2.
the act of wasting money or spending money until there is none left :
concerns about the dissipation of the country's wealth
3.
( disapproving ) behaviour which is enjoyable but has a harmful effect on you
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WORD ORIGIN
late Middle English (in the sense complete disintegration ): from Latin dissipatio(n-) , from the verb dissipare , from dis- apart, widely + supare to throw.