v. dis·si·pat·ed, dis·si·pat·ing, dis·si·pates
a. To break apart or attenuate to the point of disappearing: The wind finally dissipated the smoke. See Synonyms at scatter.
b. To drive away; cause to vanish: a discovery that dissipated his doubts.
a. To spend or expend intemperately or wastefully; squander: dissipated his fortune in casinos.
b. To use up, especially recklessly; exhaust: dissipated their energy. See Synonyms at waste.
3. To cause to lose (energy, such as heat) irreversibly.
1. To be attenuated and vanish: The dark clouds finally dissipated.
2. To become dispelled; vanish: His anger dissipated in time.
[Middle English dissipaten, from Latin dissipāre, dissipāt-.]
dissi·pat′er, dissi·pa′tor n.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.