the act of irradiating.
the state of being irradiated.
intellectual or spiritual enlightenment.
a ray of light; beam.
Optics. the apparent enlargement of an object when seen against a dark background.
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.
exposure or the process of exposure to x-rays or other radiation.
Physics. irradiance.

1580–90; < Late Latin irradiātiōn- (stem of irradiātiō). See ir-1, radiation

postirradiation, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
irradiation (ɪˌreɪdɪˈeɪʃən)
1.  the act or process of irradiating or the state of being irradiated
2.  the apparent enlargement of a brightly lit object when it is viewed against a dark background
3.  a shaft of light; beam or ray
4.  med
 a.  the therapeutic or diagnostic use of radiation, esp X-rays
 b.  exposure of a patient to such radiation
5.  radiation another name for irradiance

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

irradiation ir·ra·di·a·tion (ĭ-rā'dē-ā'shən)

  1. Exposure or subjection to the action of radiation for diagnostic or therapeutic purposes.

  2. Medical treatment by exposure to radiation.

  3. The spread of a nervous impulse beyond the usual path of conduction.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
But however crude and destructive the decontamination process, it has proved
  effective: irradiation does indeed destroy anthrax.
The others mated with beetles rendered sterile by irradiation.
But also have in mind that electricity prices can be much higher also, so it
  compensates for the lower irradiation.
Irradiation works, but raises feasibility and other concerns.
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