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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]