emanation

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The act or an instance of emanating.
• noun Something that issues from a source; an emission.
• noun Chemistry Any of several radioactive gases that are isotopes of radon and are products of radioactive decay.

from The Century Dictionary.

• noun Specifically, in radioactivity, an unstable gaseous disintegration-product spontaneously produced from a radioactive substance.
• noun The act of flowing or issuing from a fountainhead or origin; emission; radiation.
• noun In philosophy: Efficient causation due to the essence and not to any particular action of the cause. Thus, when the trunk of a tree is moved, the branches go along with it by virtue of emanation. Hence — The production of anything by such a process of causation, as from the divine essence.
• noun That which issues, flows, or is given out from any substance or body; effiux; effiuvium: as, the odor of a flower is an emanation of its particles.
• noun In algebra, the process of obtaining the successive emanants of a quantic.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of flowing or proceeding from a fountain head or origin.
• noun That which issues, flows, or proceeds from any object as a source; efflux; an effluence.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The act of flowing or proceeding from a fountain head or origin.
• noun That which issues, flows, or proceeds from any object as a source; efflux; an effluence; as, perfume is an emanation from a flower.
• noun uncountable, obsolete, chemistry radon

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun (theology) the origination of the Holy Spirit at Pentecost
• noun the act of emitting; causing to flow forth
• noun something that is emitted or radiated (as a gas or an odor or a light, etc.)