#1 irradiation n. the condition of being exposed to radiation. wn
#2 irradiation n. [beam, beam of light, light beam, ray, ray of light, shaft, shaft of light] a column of light (as from a beacon). wn
#3 irradiation n. (physiology) the spread of sensory neural impulses in the cortex. wn
#4 irradiation n. the apparent enlargement of a bright object when viewed against a dark background. wn
#5 irradiation n. (Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus. wn
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