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1.
the condition of being exposed to radiation
2.
a column of light (as from a beacon)
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
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