(physics) The emission of electrons from a metal or semiconductor, under the influence of a strong electric field, by quantum tunnelling.

An ejaculation or orgasm while asleep, often accompanied by an erotic dream.

(physics) The emission of electrons from the surface of a solid when bombarded with electrons or other charged particles

A measurement performed on motor vehicles, required by the DMV, to prevent issuing valid registration if an excessive amount of waste fumes are produced during typical use. Cars typically are placed on a dynamometer to simulate different driving speeds.

(uncountable, engineering, acoustics) A phenomenon wherein external stimuli such as mechanical loading generate physical vibrations.

A market-based approach to controlling pollution by providing incentives for reducing the emissions of pollutants.

(astronomy) A nebula composed of ionized gases which produce visible light (as distinct from a reflection nebula, which reflects the light produced by neighboring stars).

plural of field emission

(physics) A discredited scientific theory, once considered an alternative to special relativity, proposing that light is emitted at speed c relative to its source instead of applying the invariance postulate.

plural of acoustic emission