/ Dictionary / Index D dissipation: Meaning and Definition of Find definitions for: dis•si•pa•tion Pronunciation: (dis"u-pā'shun), [key] — n. the act of dissipating. the state of being dissipated; dispersion; disintegration. a wasting by misuse: the dissipation of a fortune. mental distraction; amusement; diversion. dissolute way of living, esp. excessive drinking of liquor; intemperance. a process in which energy is used or lost without accomplishing useful work, as friction causing loss of mechanical energy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dissipation (Thesaurus) dissipated dissipation trail Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language