/ ˈdɪsɪpeɪt; NAmE / verb ( formal )
1.
to gradually become or make sth become weaker until it disappears :
[ v ]
Eventually, his anger dissipated.
[ vn ]
Her laughter soon dissipated the tension in the air.
2.
[ vn ] to waste sth, such as time or money, especially by not planning the best way of using it
SYN squander
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WORD ORIGIN
late Middle English : from Latin dissipat- scattered, from the verb dissipare , from dis- apart, widely + supare to throw.