[ih-vap-uh-rey-shuh n]


the act or process of evaporating.
the state of being evaporated.
Archaic. matter or the quantity of matter evaporated or passed off in vapor.

Origin of evaporation

1350–1400; Middle English evaporacioun < Latin ēvapōrātiōn- (stem of ēvapōrātiō). See evaporate, -ion
Related formse·vap·o·ra·tive [ih-vap-uh-rey-tiv, -er-uh-tiv] /ɪˈvæp əˌreɪ tɪv, -ər ə tɪv/, adjectivee·vap·o·ra·tive·ly, adverbnon·e·vap·o·ra·tion, nounnon·e·vap·o·ra·tive, adjectivepre·e·vap·o·ra·tion, nounun·e·vap·o·ra·tive, adjective
Can be confusedevanescence evaporation liquefaction melting thawing transpiration vaporization
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Word Origin and History for evaporation

late 14c., from Old French évaporation and directly from Latin evaporationem (nominative evaporatio), noun of action from past participle stem of evaporare "disperse in vapor or steam," from ex- "out" (see ex-) + vapor "steam" (see vapor).

Online Etymology Dictionary, © 2010 Douglas Harper

evaporation in Medicine




A change from liquid to vapor form.
Loss of volume of a liquid by conversion into vapor.volatilization
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

evaporation in Science



The change of a liquid into a vapor at a temperature below the boiling point. Evaporation takes place at the surface of a liquid, where molecules with the highest kinetic energy are able to escape. When this happens, the average kinetic energy of the liquid is lowered, and its temperature decreases.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

evaporation in Culture


The changing of a liquid into a gas, often under the influence of heat (as in the boiling of water). (See vaporization.)


The evaporation of water from the oceans is a major component in the hydrologic cycle.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.