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1. (n.) radiation
the process in which energy is emitted as particles or waves.
2. radiation
the complete process in which energy is emitted by one body, transmitted through an intervening medium or space, and absorbed by another body.
3. radiation
the energy transferred by these processes.
4. radiation
the act or process of radiating.
5. radiation
something that is radiated.
6. radiation
radial arrangement of parts.
Etymology: (1545–55; < L radiātiō gleam. See radiate , -tion)
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| Definition of 'Radiation' |
Princeton's WordNet |
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1. (noun) radiation
energy that is radiated or transmitted in the form of rays or waves or particles
2. (noun) radiation
the act of spreading outward from a central source
3. (noun) radiation sickness, radiation syndrome, radiation
syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses cause diarrhea and nausea and vomiting and sometimes loss of hair; greater exposure can cause sterility and cataracts and some forms of cancer and other diseases; severe exposure can cause death within hours
"he was suffering from radiation"
4. (noun) radiation, radioactivity
the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
5. (noun) radiation
the spread of a group of organisms into new habitats
6. (noun) radiation
a radial arrangement of nerve fibers connecting different parts of the brain
7. (noun) radiotherapy, radiation therapy, radiation, actinotherapy, irradiation
(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance
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1. (noun) radiation
energy produced by a nuclear reaction
dangerous levels of radiation
2. radiation
rays of energy produced by heat, light, etc.
cell phone radiation hazards
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| Definition of 'Radiation' |
Webster Dictionary |
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1. (noun) Radiation
the act of radiating, or the state of being radiated; emission and diffusion of rays of light; beamy brightness
2. (noun) Radiation
the shooting forth of anything from a point or surface, like the diverging rays of light; as, the radiation of heat
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| Definition of 'Radiation' |
U.S. National Library of Medicine |
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1. Radiation
Emission or propagation of electromagnetic energy (waves/rays), or the waves/rays themselves; a stream of electromagnetic particles (electrons, neutrons, protons, alpha particles) or a mixture of these. The most common source is the sun.
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| Definition of 'Radiation' |
The Standard Electrical Dictionary |
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1. Radiation
The traveling or motion of ether waves through space.
[Transcriber's note: The modern term corresponding to this definition is photons. The modern concept of radiation also includes particles-- neutrons, protons, alpha (helium) and beta (electrons) rays and other exotic items.]
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Definitions of Radiation 
