Dependency, dependent or depend may refer to: Computer science Dependency (computer science) or coupling, a state in which one object uses a function of another object Data dependency, which describes a dependence relation between statements in a program Dependence analysis, in compiler theory Dependency (UML), a relationship between one element in the Unified Modeling Language Dependency relation, a type of binary relation in mathematics and computer science. Functional dependency, a relationship between database attributes allowing normalization. Dependent type, in computer science and logic, a type that depends on a value Hidden dependency, a relation in which a change in many areas of a program produces unexpected side-effects Library dependency, a relationship described in and managed by a software dependency manager tool to mitigate dependency hell Economics Dependant (British English) (Dependent - American English), a person who depends on another as a primary source of income Dependency ratio, in economics, the ratio of the economically dependent part of the economy to the productive part Dependency theory, an economic worldview that posits that resources flow from poor states to wealthy states Linguistics Dependent and independent verb forms, distinct verb forms in Goidelic languages used with or without a preceding particle Dependency grammar is based on the dependency relation between the lexemes of a sentence Dependent clause Mathematics Dependency relation, a type of binary relation in mathematics and computer science. Dependent and independent variables, in mathematics, the variable that depends on the independent variable The absence of independence (probability theory) Tail dependence, from probability theory Serial dependence, in statistics Correlation and dependence Mean dependence Medicine and psychology Codependence, a pattern of detrimental behavioral interactions within a dysfunctional relationship Dependency need, the real need of the organism, or something that individuals cannot provide for themselves Dependent personality disorder, a personality disorder characterized by a pervasive psychological dependence on other people Substance dependence, an adaptive state associated with a withdrawal syndrome upon cessation of repeated exposure to a stimulus (e.g., drug intake) Physical dependence, dependence that involves persistent physical–somatic withdrawal symptoms (e.g., fatigue and delirium tremens) Psychological dependence, dependence that involves emotional–motivational withdrawal symptoms (e.g., dysphoria and anhedonia) Alcohol dependence Amphetamine dependence Barbiturate dependence Benzodiazepine dependence Caffeine dependence Cannabis dependence Cocaine dependence Opioid dependence Tanning dependence Political science Dependent territory, a classification of territory, especially a region that is not a sovereign state but a possession of same Crown Dependencies, three specific dependencies of the