American English

Definition of radiation noun from the Oxford Advanced American Dictionary



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  1. 1[uncountable, countable] powerful and very dangerous rays that are sent out from radioactive substances high levels/doses of radiation that damage cells the link between exposure to radiation and childhood cancer a radiation leak from a nuclear power station radiation sickness the radiations emitted by radium
  2. 2[uncountable] heat, energy, etc. that is sent out in the form of rays ultraviolet radiation electromagnetic radiation from power lines
  3. 3(also radiation therapy) [uncountable] the treatment of cancer and other diseases using radiation compare chemotherapy, radiotherapy
See the Oxford Advanced Learner's Dictionary entry: radiation