Dissipation /(dĭs`sĭ*pā"shŭn)/

Dis·si·pa·tion

Dissipation

n.
  1. The act of dissipating or dispersing; a state of dispersion or separation; dispersion; waste.
    Without loss or dissipation of the matter.
    The famous dissipation of mankind.
  2. A dissolute course of life, in which health, money, etc., are squandered in pursuit of pleasure; profuseness in vicious indulgence, as late hours, riotous living, etc.; dissoluteness.
    To reclaim the spendthrift from his dissipation and extravagance.
    — P. Henry.
  3. A trifle which wastes time or distracts attention.
    Prevented from finishing them [the letters] a thousand avocations and dissipations.

Phrases & Compounds
Dissipation of energy
Same as Degradation of energy, under Degradation.