Dependency (noun)

1. The state of depending on someone or something.
2. The state of being dependent or reliant on something or someone.

Origin:

Late middle english: from old french dependance, from dependre "hang down" (see depend).

Examples:

1. The country's economy was in a state of dependency on foreign aid.
2. He had a dependency on alcohol and couldn't stop drinking.
3. The dependency on oil was causing problems for the country.
4. The child had a dependency on his mother and couldn't be left alone.
5. The dependency on technology was causing problems with communication.