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n 1  :  the act or process of making habitual or accustomed  2 a  :  tolerance to the effects of a drug acquired through continued use  b  :  psychological dependence on a drug after a period of use - compare ADDICTION   3  :  a form of nonassociative learning characterized by a decrease in responsiveness upon repeated exposure to a stimulus - compare SENSITIZATION3   .

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Greater El Monte Community Hospital (South El Monte, California - Los Angeles County)