emission (redirected from Positron emission)

e·mis·sion  (-mshn)

n.

1. The act or an instance of emitting.

2. Something emitted.

3. A substance discharged into the air, especially by an internal combustion engine.

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[Latin missi, missin-, a sending out, from missus, past participle of mittere, to send out; see emit.]

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emission [ɪˈmɪʃən]

n

1. the act of emitting or sending forth

2. (Physics / General Physics) energy, in the form of heat, light, radio waves, etc., emitted from a source

3. a substance, fluid, etc., that is emitted; discharge

4. (Physics / General Physics) a measure of the number of electrons emitted by a cathode or electron gun at 1000°C the emission is 3 mA See also secondary emission, thermionic emission

5. (Life Sciences & Allied Applications / Physiology) Physiol any bodily discharge, esp an involuntary release of semen during sleep

6. (Economics, Accounting & Finance / Banking & Finance) an issue, as of currency

[from Latin ēmissiō, from ēmittere to send forth, emit]

emissive  adj

Thesaurus

Noun	1.	emission - the act of emitting; causing to flow forth emanation egression, egress, emergence - the act of coming (or going) out; becoming apparent radiation - the act of spreading outward from a central source venting, discharge - the act of venting
	2.	emission - a substance that is emitted or released discharge material, stuff - the tangible substance that goes into the makeup of a physical object; "coal is a hard black material"; "wheat is the stuff they use to make bread" exudate, exudation - a substance that oozes out from plant pores transudate, transudation - a substance that transudes effluvium - a foul-smelling outflow or vapor (especially a gaseous waste) rheum - 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
	3.	emission - the release of electrons from parent atoms photoemission - 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 radioactivity, radiation - the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay release - a process that liberates or discharges something; "there was a sudden release of oxygen"; "the release of iodine from the thyroid gland" 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
	4.	emission - any of several bodily processes by which substances go out of the body; "the discharge of pus" expelling, discharge bodily function, bodily process, body process, activity - an organic process that takes place in the body; "respiratory activity" ejaculation - the discharge of semen in males excreting, excretion, voiding, elimination, evacuation - the bodily process of discharging waste matter menses, menstruation, catamenia, menstruum, period, flow - the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause; "the women were sickly and subject to excessive menstruation"; "a woman does not take the gout unless her menses be stopped"--Hippocrates; "the semen begins to appear in males and to be emitted at the same time of life that the catamenia begin to flow in females"--Aristotle
	5.	emission - the occurrence of a flow of water (as from a pipe) flow, flowing - the motion characteristic of fluids (liquids or gases)

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emission

noun giving off or out, release, shedding, leak, radiation, discharge, transmission, venting, issue, diffusion, utterance, ejaculation, outflow, issuance, ejection, exhalation, emanation, exudation the emission of gases such as carbon dioxide

Translations

emission [ɪˈmɪʃən]

A. N

1. [of light, smell] → emisión f (Anat) [of semen] → expulsión f

2. emissions (= fumes) → emisiones fpl

B. CPD emission controls NPL → controles mpl de emisiones

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emission [ɪˈmɪʃ^ən]

n (= release) [gas, radiation] → émission f

modif [standards, levels] → d'émissions

npl emissions (= substances released) → émissions fpl
carbon dioxide emissions → émissions de dioxyde de carbone
greenhouse gas emissions → émissions de gaz à effet de serre
exhaust emissions → émissions de gaz d'échappement

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emission

n → Ausstrahlung f, → Abstrahlung f; (of fumes, X-rays) → Emission f (spec); (of gas, smell) → Verströmen nt, → Ausströmen nt; (of liquid) → Ausströmen nt; (gradual) → Absonderung f, → Abscheidung f; (of vapour, smoke: continuous) → Abgabe f; (of lava) → Ausstoßen nt; (of sparks) → Versprühen nt

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emission [ɪˈmɪʃ/ən] n (of fumes, gas) → esalazione f

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emission [ɪˈmɪʃ/ən] n (of fumes, gas) → esalazione f

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emission emit