[ em-uh-ney-shuh n ]
/ ˌɛm əˈneɪ ʃən /


an act or instance of emanating.
something that emanates or is emanated.
Physical Chemistry. a gaseous product of radioactive disintegration, including radon, thoron, and actinon. Symbol: Em

Origin of emanation

1560–70; < Late Latin ēmānātiōn- (stem of ēmānātiō), equivalent to ēmānāt(us) (see emanate) + -iōn- -ion

Related forms

em·a·na·tion·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for emanation

British Dictionary definitions for emanation


/ (ˌɛməˈneɪʃən) /


an act or instance of emanating
something that emanates or is produced; effusion
a gaseous product of radioactive decay, such as radon

Derived Forms

emanational, 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

Medicine definitions for emanation


[ ĕm′ə-nāshən ]


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