EMISSION

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 Dictionary entry overview: What does emission mean? 

• EMISSION (noun)
  The noun EMISSION has 5 senses:

1. the act of emitting; causing to flow forth

2. a substance that is emitted or released

3. the release of electrons from parent atoms

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

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

  Familiarity information: EMISSION used as a noun is common.

 Dictionary entry details 

• EMISSION (noun)

Sense 1

Meaning:

The act of emitting; causing to flow forth

Classified under:

Nouns denoting acts or actions

Synonyms:

emanation; emission

Hypernyms ("emission" is a kind of...):

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

Hyponyms (each of the following is a kind of "emission"):

radiation (the act of spreading outward from a central source)

discharge; venting (the act of venting)

Derivation:

emit (expel (gases or odors))

emit (give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.)

Sense 2

Meaning:

A substance that is emitted or released

Classified under:

Nouns denoting substances

Synonyms:

discharge; emission

Hypernyms ("emission" is a kind of...):

material; stuff (the tangible substance that goes into the makeup of a physical object)

Hyponyms (each of the following is a kind of "emission"):

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)

Sense 3

Meaning:

The release of electrons from parent atoms

Classified under:

Nouns denoting natural processes

Hypernyms ("emission" is a kind of...):

release (a process that liberates or discharges something)

Hyponyms (each of the following is a kind of "emission"):

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)

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)

Sense 4

Meaning:

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

Classified under:

Nouns denoting natural processes

Synonyms:

discharge; emission; expelling

Context example:

the discharge of pus

Hypernyms ("emission" is a kind of...):

activity; bodily function; bodily process; body process (an organic process that takes place in the body)

Hyponyms (each of the following is a kind of "emission"):

ejaculation (the discharge of semen in males)

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)

Sense 5

Meaning:

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

Classified under:

Nouns denoting natural events

Hypernyms ("emission" is a kind of...):

flow; flowing (the motion characteristic of fluids (liquids or gases))

 Context examples 

Accurately predicting carbon emissions from natural systems is vital to the reliability of calculations used to understand the pace of climate change, and the effects of a warmer world.

(Climate change could double greenhouse gas emissions from freshwater ecosystems, University of Cambridge)

As the proliferation of cancer cells is much higher than normal cells, tumor cells exhibit an increased rate of C-11 choline uptake and incorporation, allowing tunor imaging with positron emission tomography (PET).

(Carbon C 11 Choline, NCI Thesaurus)

Although the mechanism is unclear, carbon-11 acetate preferentially accumulates in tumor tissue, serving as a tracer for imaging tumors with positron emission tomography (PET).

(Carbon-11 acetate, NCI Thesaurus)

These vehicle emissions are mixtures of gases and particles that are easily inhaled and have adverse health effects.

(Pregnancy hypertension risk increased by traffic-related air pollution, National Institutes of Health)

NGC 1333's proximity and strong infrared emissions made it visible to astronomers using some of the earliest infrared instruments.

(Spitzer Studies a Stellar Playground With a Long History, NASA)

Upon binding, the radioisotope moiety may be detected using positron emission tomography (PET), thereby allowing the imaging and quantification of HER2-expressing tumor cells.

(Copper Cu 64-DOTA-Trastuzumab, NCI Thesaurus)

Their use would dramatically reduce emissions compared to traditional materials, helping to mitigate the human impact on climate change.

(Visualising heat flow in bamboo could help design more energy-efficient and fire-safe buildings, University of Cambridge)

The extent of (61)Cu-ATSM retention in tissue is inversely related to the state of tissue oxygenation allowing the quantitation of tissue hypoxia with positron emission tomography (PET).

(Copper Cu 61-ATSM, NCI Thesaurus)

It includes ultraviolet, infrared, and low-emission laser frequencies.

(Actinotherapy, NCI Thesaurus)

NASA's multiyear Carbon in Arctic Reservoirs Vulnerability Experiment (CARVE) is the first experiment to establish emission rates for a large region of the Arctic.

(Alaska Shows No Signs of Rising Arctic Methane, NASA)