Definitions for radiationˌreɪ diˈeɪ ʃən

This page provides all possible meanings and translations of the word radiation

Princeton's WordNetRate this definition:(0.00 / 0 votes)

  1. radiation(noun)

    energy that is radiated or transmitted in the form of rays or waves or particles

  2. radiation(noun)

    the act of spreading outward from a central source

  3. radiation sickness, radiation syndrome, radiation(noun)

    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. radiation, radioactivity(noun)

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

  5. radiation(noun)

    the spread of a group of organisms into new habitats

  6. radiation(noun)

    a radial arrangement of nerve fibers connecting different parts of the brain

  7. radiotherapy, radiation therapy, radiation, actinotherapy, irradiation(noun)

    (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance

WiktionaryRate this definition:(0.00 / 0 votes)

  1. radiation(Noun)

    The shooting forth of anything from a point or surface, like the diverging rays of light; as, the radiation of heat.

  2. radiation(Noun)

    The process of radiating waves or particles.

  3. radiation(Noun)

    The transfer of energy via radiation (as opposed to convection or conduction)

  4. radiation(Noun)

    Radioactive energy

  5. Origin: From radiatio.

Webster DictionaryRate this definition:(0.00 / 0 votes)

  1. Radiation(noun)

    the act of radiating, or the state of being radiated; emission and diffusion of rays of light; beamy brightness

  2. Radiation(noun)

    the shooting forth of anything from a point or surface, like the diverging rays of light; as, the radiation of heat

  3. Origin: [L. radiatio: cf. F. radiation.]

FreebaseRate this definition:(0.00 / 0 votes)

  1. Radiation

    In physics, radiation is a process in which energetic particles or energetic waves travel through a vacuum, or through matter-containing media that are not required for their propagation. Waves of a mass filled medium itself, such as water waves or sound waves, are usually not considered to be forms of "radiation" in this sense. Radiation can be classified as either ionizing or non-ionizing according to whether it ionizes or does not ionize ordinary chemical matter. The word radiation is often colloquially used in reference to ionizing radiation, but the term radiation may correctly also refer to non-ionizing radiation as well. The particles or waves radiate from a source. This aspect leads to a system of measurements and physical units that are applicable to all types of radiation. Because radiation expands as it passes through space, and as its energy is conserved, the power of all types of radiation follows an inverse-square law in relation to the distance from its source. Both ionizing and non-ionizing radiation can be harmful to organisms and can result in changes to the natural environment. In general, however, ionizing radiation is far more harmful to living organisms per unit of energy deposited than non-ionizing radiation, since the ions that are produced, even at low radiation powers, have the potential to cause DNA damage. By contrast, most non-ionizing radiation is harmful to organisms only in proportion to the thermal energy deposited, and is conventionally considered harmless at low powers that do not produce a significant temperature rise. Ultraviolet radiation in some aspects occupies a middle ground, as it has some features of both ionizing and non-ionizing radiation. Although nearly all of the ultraviolet spectrum that penetrates the Earth's atmosphere is non-ionizing, this radiation does far more damage to many molecules in biological systems than can be accounted for by heating effects. These properties derive from ultraviolet's power to alter chemical bonds, even without having quite enough energy to ionize atoms.

U.S. National Library of MedicineRate this definition:(0.00 / 0 votes)

  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.

The Standard Electrical DictionaryRate this definition:(0.00 / 0 votes)

  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.]

British National Corpus

  1. Nouns Frequency

    Rank popularity for the word 'radiation' in Nouns Frequency: #2018


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