Source : Webster's Revised Unabridged Dictionary (1913)

Dependency \De*pend"en*cy\, n.; pl. {Dependencies}.
   1. State of being dependent; dependence; state of being
      subordinate; subordination; concatenation; connection;
      reliance; trust.

            Any long series of action, the parts of which have
            very much dependency each on the other. --Sir J.
                                                  Reynolds.

Source : WordNet®

dependency
     n 1: lack of independence or self-sufficiency [syn: {dependence},
           {dependance}]
     2: being abnormally tolerant to and dependent on something that
        is psychologically or physically habit-forming (especially
        alcohol or narcotic drugs) [syn: {addiction}, {dependence},
         {habituation}]
     3: a geographical area politically controlled by a distant
        country [syn: {colony}]