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 spectroscopy, photoemission spectroscopy, flame emission spectroscopy and other types of spectroscopy
Emission standard, requirements that set specific limits to the amount of pollutants that can be released into the environment
Emission theory, 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
Emissions trading, a market-based approach used to control pollution by providing economic incentives for achieving reductions in the emissions of pollutants
Ejaculation, the ejecting of semen from the penis; also, specifically:
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
Exhalation, especially where the velocity of exhaled air can influence the harmonic generating properties of a vibrating body, such as the reed of a musical instrument like the saxophone
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