1 Reliance on another person for financial, emotional, or some other form of support.
2 A psychological and sometimes physical state of reliance on a substance, especially on a narcotic drug such as cocaine or heroin, but also on everyday drugs such as nicotine, caffeine, or alcohol, characterized by a compulsion to take the drug in order to experience its effects and generally also withdrawal and tolerance (3). See also addiction, cross-dependence, nucleus accumbens, substance dependence.
3 In probability theory and statistics, a relation between variables that are correlated with one another.
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