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radiation

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UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ˌreɪdiˈeɪʃən/US:USA pronunciation: IPA and respellingUSA pronunciation: IPA/ˌreɪdiˈeɪʃən/ ,USA pronunciation: respelling(rā′dē āshən)


WordReference Random House Learner's Dictionary of American English © 2026
ra•di•a•tion /ˌreɪdiˈeɪʃən/USA pronunciation   n. 
  1. Physics[uncountable]
    • the process in which energy is given off by one body as particles or waves, sent through space or through some substance, and absorbed by another body.
    • the energy transferred by this process.
  2. Physics something radiated:[countable]harmful radiations.
  3. radioactivity:[uncountable]nuclear radiation.

WordReference Random House Unabridged Dictionary of American English © 2026
ra•di•a•tion  (rā′dē āshən),USA pronunciation n. 
  1. Physics
    • the process in which energy is emitted as particles or waves.
    • the complete process in which energy is emitted by one body, transmitted through an intervening medium or space, and absorbed by another body.
    • the energy transferred by these processes.
  2. Physicsthe act or process of radiating.
  3. Physicssomething that is radiated.
  4. radial arrangement of parts.
  • Latin radiātiōn- (stem of radiātiō) a glittering, shining. See radiate, -ion
  • 1545–55
ra′di•ation•al, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::
radiation /ˌreɪdɪˈeɪʃən/ n
    • the emission or transfer of radiant energy as particles, electromagnetic waves, sound, etc
    • the particles, etc, emitted, esp the particles and gamma rays emitted in nuclear decay
  1. Also called: radiation therapy treatment using a radioactive substance
  2. the act, state, or process of radiating or being radiated
ˌradiˈational adj
'radiation' also found in these entries (note: many are not synonyms or translations):

🗣️Forum discussions with the word(s) "radiation" in the title:

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