dependency in WordNet English dictionary

1. being abnormally tolerant to and dependent on something that is psychologically or physically habit-forming (especially alcohol or narcotic drugs)
   addiction  dependence  dependance  dependency  habituation 
   
2. a geographical area politically controlled by a distant country
   colony  dependency 
   
3. the state of relying on or being controlled by someone or something else
   dependence  dependance  dependency