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

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

emanational, adjective
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World English Dictionary
emanation (ˌɛməˈneɪʃən)
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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Word Origin & History

1570, from L.L. emanationem (nom. emanatio), from L. emanare "flow out, arise, proceed," from ex- "out" + manare "to flow."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

emanation em·a·na·tion (ěm'ə-nā'shən)

  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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Example sentences
My subsequent sonic emanation of joyous surprise nearly sent us into the guardrail.
The astonishing stranger is green from head to foot, a kind of emanation from nature.
Second, emanation of radon from uranium increases in the foliation.
Their work is about the transfer of energy, the emanation of the soul, and the
  common denominators of the human experience.
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