To scatter in various directions; disperse; dispel. The wind began to dissipate the fog, revealing the landscape beneath.
To spend or use wastefully or extravagantly; squander; deplete. He dissipated his fortune on lavish parties and expensive cars.
To cause to become less intense or to disappear gradually. The tension in the room began to dissipate after the manager's reassuring words.
As the sun rose, the morning mist began to dissipate.