Dependency has a number of meanings: * In project management, a dependency is a link amongst a project's terminal elements. * In computer science, dependency is a state in which one object uses a functionality of another object. This may cause changes on implementation of one object that can affect implementation of another object. * In behavioral medicine, dependence describes a continuum of physical and psychological attachments related to the concept of addiction. * Dependency theory is an economic worldview. * A dependent area is a classification of territory. * The Ross Dependency is an area of Antarctica claimed by New Zealand. * Co-dependency is a behavioural condition. * A chemical dependency is such a strong need for a substance that it becomes necessary to have this substance just to function properly. * A former or current colony