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Wordnet 3.0

NOUN (5)

1. the act of emitting; causing to flow forth;
[syn: emission, emanation]

2. a substance that is emitted or released;
[syn: discharge, emission]

3. the release of electrons from parent atoms;

4. any of several bodily processes by which substances go out of the body;
- Example: "the discharge of pus"
[syn: discharge, emission, expelling]

5. the occurrence of a flow of water (as from a pipe);


The Collaborative International Dictionary of English v.0.48:

Emission \E*mis"sion\, n. [L. emissio: cf. F. ['e]mission. See Emit.] 1. The act of sending or throwing out; the act of sending forth or putting into circulation; issue; as, the emission of light from the sun; the emission of heat from a fire; the emission of bank notes. [1913 Webster] 2. That which is sent out, issued, or put in circulation at one time; issue; as, the emission was mostly blood. [1913 Webster] Emission theory (Physics), the theory of Newton, regarding light as consisting of emitted particles or corpuscles. See Corpuscular theory, under Corpuscular. [1913 Webster]
WordNet (r) 3.0 (2006):

emission n 1: the act of emitting; causing to flow forth [syn: emission, emanation] 2: a substance that is emitted or released [syn: discharge, emission] 3: the release of electrons from parent atoms 4: any of several bodily processes by which substances go out of the body; "the discharge of pus" [syn: discharge, emission, expelling] 5: the occurrence of a flow of water (as from a pipe)
Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "emission": blowout, discharge, disgorgement, effusion, egestion, ejaculation, ejection, elimination, emanation, emergence, emersion, eructation, eruption, excretion, expulsion, extravasation, extrusion, exudation, flow, flux, issuance, issue, jet, outburst, outpour, secretion, spout, spurt, squirt, surfacing, transudation, vent
Bouvier's Law Dictionary, Revised 6th Ed (1856):

EMISSION, med. jur. The act by which any matter whatever is thrown from the body; thus it is usual to say, emission of urine, emission of semen, &c. 2. In cases of rape, when the fact of penetration is proved, it may be left to the jury whether emission did or did not take place. Proof of emission would perhaps be held to be evidence of penetration. Addis. R. 143; 2 So. Car. Const. R. 351; 2 Chitty, Crim. Law, 810; 1 Beck's Med. Jur. 140 1 Russ. C. & M. 560; 1 East, P. C. 437.