dissipation

noun dissipations

1. countable, uncountable The act of dissipating or dispersing; a state of dispersion or separation; dispersion; waste. without loss or dissipation of the matter
2. countable, uncountable A dissolute course of life, in which health, money, etc., are squandered in pursuit of pleasure; profuseness in immoral indulgence, as late hours, riotous living, etc.; dissoluteness. 18th century, Patrick Henry in a parliamentary debate to reclaim the spendthrift from his dissipation and extravagance
3. countable, uncountable A trifle which wastes time or distracts attention. Prevented from finishing them [the letters] a thousand avocations and dissipations.
4. countable, uncountable A loss of energy, usually as heat, from a dynamic system. They conclude[…] the planet will have a final period of rotation between 56 and 88 days, depending on the assumed form of the dissipation function.