• synonyms


[em-uh-ney-shuh n]
  1. an act or instance of emanating.
  2. something that emanates or is emanated.
  3. Physical Chemistry. a gaseous product of radioactive disintegration, including radon, thoron, and actinon. Symbol: Em
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Origin of emanation

1560–70; < Late Latin ēmānātiōn- (stem of ēmānātiō), equivalent to ēmānāt(us) (see emanate) + -iōn- -ion
Related formsem·a·na·tion·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for emanations


  1. an act or instance of emanating
  2. something that emanates or is produced; effusion
  3. a gaseous product of radioactive decay, such as radon
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Derived Formsemanational, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for emanations



1560s, from Late Latin emanationem (nominative emanatio), noun of action from past participle stem of Latin emanare "flow out, arise, proceed," from ex- "out" (see ex-) + manare "to flow," from PIE root *ma- "damp."

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Online Etymology Dictionary, © 2010 Douglas Harper

emanations in Medicine


  1. Something that issues from a source; an emission.
  2. Any of several radioactive gases that are isotopes of radon and are products of radioactive decay.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.