irradiation

(noun) the condition of being exposed to radiation.

(noun) a column of light (as from a beacon). Synonyms: beam, beam of light, light beam, ray, ray of light, shaft, shaft of light.

(noun) (physiology) the spread of sensory neural impulses in the cortex.

(noun) the apparent enlargement of a bright object when viewed against a dark background.

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

(noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance. Synonyms: radiotherapy, radiation therapy, radiation, actinotherapy.