Dependence (noun)

1. A state of relying on or needing someone or something for support or assistance.
2. An addiction to a substance or behavior.

Origin:

From latin dependentia, from dependere ("to hang from, rely on, be subject to").

Examples:

1. The country's dependence on oil caused economic problems when prices dropped.
2. The child's dependence on her parents made it hard for her to leave home.
3. The company's dependence on the government contracts put it at risk.
4. The patient's dependence on the medication made it hard to wean off.
5. The individual's dependence on the substance caused health problems.