early 15c., from Middle French dépendance, from dependre (see depend). Originally also dependance (the earlier form), depending whether the writer had French or Latin foremost in mind; the Latin form gradually predominated and after c.1800 dependance is rare. As an adjective from c.1600.
dependence de·pend·ence (dĭ-pěn'dəns)
n.
The state of being dependent, as for support.
Subordination to someone or something needed or greatly desired.
A compulsive or chronic need; an addiction.