irradiation

noun6

1. •
   An act of irradiating, or state of being irradiated.
2. •
   a process of sterilization whereby radiation is passed through a bag containing food, utensils, etc., to sterilize the contents.
3. •
   Synonym of radiotherapy.
4. •
   The apparent enlargement of a bright object seen upon a dark ground, due to the fact that the portions of the retina around the image are stimulated by the intense light; as when a dark spot on a white ground appears smaller, or a white spot on a dark ground larger, than it really is, especially when a little out of focus.
5. •
   (no longer used) illumination; irradiance; brilliance.
6. •
   (figurative, no longer used) mental light or illumination.