"irradiation" in the noun sense

1. irradiation

the condition of being exposed to radiation

2. beam, beam of light, light beam, ray, ray of light, shaft, shaft of light, irradiation

a column of light (as from a beacon)

3. irradiation

physiology) the spread of sensory neural impulses in the cortex

4. irradiation

the apparent enlargement of a bright object when viewed against a dark background

5. irradiation

Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus

6. radiotherapy, radiation therapy, radiation, actinotherapy, irradiation

medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance

Source: WordNet® (An amazing lexical database of English)

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