What do a.m. and p.m. stand for?


[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
emanational, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for emanation
  • 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.
  • emanation of radon depends entirely on the chemistry of the rock.
  • The lower jaw, which is mostly covered by the mount, is decorated with an emanation of scrolls.
  • We are also measuring radon emanation from core samples to determine if changes occurred as a result of the remediation process.
British Dictionary definitions for emanation


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
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Word Origin and History for emanation

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."

Online Etymology Dictionary, © 2010 Douglas Harper
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emanation in Medicine

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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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