The term dependency means to show dependence or something that is dependent. It can also mean being dependent from a state or country. One can also be dependent on another person.
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http://www.scselfservice.org/juvdep/juvdepwhat.htm
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There are a number of leading dependancy theories that is public and accessible. Two of the leading are media and sociology. To check out other theories please check out "Uses and gratifications theory".