Emission coefficient, a coefficient in the power output per unit time of an electromagnetic source
Emission line, or "spectral line", a dark or bright line in an otherwise uniform and continuous spectrum
Emission nebula, a cloud of ionized gas emitting light of various colors
Emission theory (relativity), a competing theory for the special theory of relativity, explaining the results of the Michelson-Morley experiment
Emission theory (vision), the proposal that visual perception is accomplished by rays of light emitted by the eyes
Other uses
Thermionic emission, the flow of charged particles called thermions from a charged metal or a charged metal oxide surface, archaically known as the Edison effect
Ejaculation, the ejection of semen from the penis; also, specifically:
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