WordWeb Online

1. The condition of being exposed to radiation
    
2. A column of light (as from a beacon)
   - beam, beam of light, light beam, ray, ray of light, shaft, shaft of light
    
3. (physiology) the spread of sensory neural impulses in the cortex
    
4. The apparent enlargement of a bright object when viewed against a dark background
    
5. (Pavlovian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus
    
6. (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance
   - radiotherapy, radiation therapy, radiation, actinotherapy

Derived forms: irradiations

Type of: condition, generalisation [Brit], generalization, illusion, light, semblance, spread, spreading, status, stimulus generalisation [Brit], stimulus generalization, therapy, treatment, visible light, visible radiation

Encyclopedia: Irradiation