Meaning of irradiation

ir•ra•di•a•tion

Pronunciation: (i-rā"dē-ā'shun), [key]
— n.
  1. the act of irradiating.
  2. the state of being irradiated.
  3. intellectual or spiritual enlightenment.
  4. a ray of light; beam.
  5. the apparent enlargement of an object when seen against a dark background.
  6. the use of x-rays or other forms of radiation for the treatment of disease, the making of x-ray photographs, the manufacture of vitamin D, etc.
  7. exposure or the process of exposure to x-rays or other radiation.
  8. irradiance.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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