Noun

1. A state of dependence; a refusal to exercise initiative:

   Frank's sullen dependency was driving his father nuts.

2. Something dependent on, or subordinate to, something else:

   In the United States' governmental structure, the military is conceived as a dependency under the executive branch.

3. A colony, or a territory subject to rule by an external power.
4. A dependence on a habit-forming substance such as a drug or alcohol; addiction.
5. In object-oriented programming, the use by one object of the functionality of another.