Medical Dictionary
Main Entry:
ad·dic·tion Pronunciation:
&-'dik-sh&n Function:
noun : compulsive physiological need for and use of a habit-formingsubstance (as heroin, nicotine, or alcohol) characterized by tolerance and by well-defined physiological symptoms upon withdrawal;
broadly : persistent compulsive use of a substanceknown by the user to be physically, psychologically, or socially harmful —compare
HABITUATION,
SUBSTANCE ABUSE