An emission is something that’s been released or emitted into the world. Car exhaust, burps, and radio broadcasts are all examples of emissions.

Technically, an emission is anything that’s been released out into the open. But more often it refers to gases being released into the air, like greenhouse gasses or emissions from power plants and factories. Anytime your body emits something (sweat, drool, gas), it’s also considered an emission. Be careful not to confuse this word with the closely spelled omission — that’s something that’s been left out.

Definitions of emission
  1. noun

    the act of emitting; causing to flow forth

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    the act of spreading outward from a central source
    discharge, venting

    the act of venting

    the act (or an instance) of subjecting a body or substance to the impact of high-energy particles (as electrons or alpha rays)
    type of:

    egress, egression, emergence

    the act of coming (or going) out; becoming apparent

  2. noun

    a substance that is emitted or released

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    exudate, exudation

    a substance that oozes out from plant pores
    transudate, transudation

    a substance that transudes

    a foul-smelling outflow or vapor (especially a gaseous waste)

    a watery discharge from the mucous membranes (especially from the eyes or nose)
    vaginal discharge

    discharge of secretions from the cervical glands of the vagina; normally clear or white

    any of various substances (soluble in water) that exude from certain plants; they are gelatinous when moist but harden on drying

    a milky exudate from certain plants that coagulates on exposure to air
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    material, stuff

    the tangible substance that goes into the makeup of a physical object

  3. noun

    any of several bodily processes by which substances go out of the body

    discharge, expelling
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    elimination, evacuation, excreting, excretion, voiding

    the bodily process of discharging waste matter
    catamenia, flow, menses, menstruation, menstruum, period

    the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause
    incontinence, incontinency

    involuntary urination or defecation
    hypermenorrhea, menorrhagia

    abnormally heavy or prolonged menstruation; can be a symptom of uterine tumors and can lead to anemia if prolonged
    micturition, urination

    the discharge of urine

    abnormally light or infrequent menstruation
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    activity, bodily function, bodily process, body process

    an organic process that takes place in the body

  4. noun

    the occurrence of a flow of water (as from a pipe)

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    type of:

    flow, flowing

    the motion characteristic of fluids (liquids or gases)

  5. noun

    the release of electrons from parent atoms

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    an emission of photoelectrons (especially from a metallic surface)
    field emission

    the emission of electrons that are stripped from parent atoms by a high electric field
    photoelectric emission

    the release or absorption of quanta above a certain energy level
    radiation, radioactivity

    the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
    secondary emission

    the emission of electrons from a surface that is bombarded by higher energy primary electrons
    thermal emission, thermionic emission

    the emission of electrons from very hot substances
    corpuscular radiation, particulate radiation

    a stream of atomic or subatomic particles that may be charged positively (e.g. alpha particles) or negatively (e.g. beta particles) or not at all (e.g. neutrons)
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    a process that liberates or discharges something

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