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The Collaborative International Dictionary of English v.0.48 (gcide)

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]