dependency

Short definition from Wiktionary

Noun

1. 1
   A state of dependence; a refusal to exercise initiative.
2. 2
   Something dependent on, or subordinate to, something else
3. 3
   The status of being a legal dependent; the relationship between a dependent and their provider.
4. 4
   A colony, or a territory subject to rule by an external power.
5. 5
   A dependence on a habit-forming substance such as a drug or alcohol.
6. 6
   Reliance on the functionality provided by some other, external component.
7. 7
   An external component whose functionality is relied on.