Dis"si*pate (dĭs"sĭ*pāt), v. t. [imp. & p. p. Dissipated; p. pr. & vb. n. Dissipating.] [L. dissipatus, p. p. of dissipare; dis- + an obsolete verb sipare, supare. to throw.] 1. To scatter completely; to disperse and cause to disappear; -- used esp. of the dispersion of things that can never again be collected or restored.

Dissipated those foggy mists of error.

I soon dissipated his fears.

The extreme tendency of civilization is to dissipate all intellectual energy.

2. To destroy by wasteful extravagance or lavish use; to squander.

The vast wealth . . . was in three years dissipated.
Bp. Burnet.

Syn. -- To disperse; scatter; dispel; spend; squander; waste; consume; lavish.

Dis"si*pate, v. i. 1. To separate into parts and disappear; to waste away; to scatter; to disperse; to vanish; as, a fog or cloud gradually dissipates before the rays or heat of the sun; the heat of a body dissipates.

2. To be extravagant, wasteful, or dissolute in the pursuit of pleasure; to engage in dissipation.