Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Latin
Origin: dissipare, from supare 'to throw'

dissipate

 verb
     
dis‧si‧pate formal
1 [intransitive and transitive] to gradually become less or weaker before disappearing completely, or to make something do this:
As he thought it over, his anger gradually dissipated.
Little by little, the smoke was dissipated by the breeze.
2 [transitive] to waste something valuable such as time, money, or energy:
His savings were soon dissipated.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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