1. Past tense of dissipar: to scatter, disperse, or cause to vanish
The fog dissipated in the morning sun.
A neblina dissipou-se sob o sol da manhã.
2. To squander or waste (money, resources, energy)
He dissipated his fortune on luxuries.
Ele dissipou sua fortuna em luxos.
3. To break up or dissolve (tension, doubt, concern)
Her explanation dissipated all doubts.
A explicação dela dissipou todas as dúvidas.