This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A mutual dependence, connection or correlation

n. Mutual dependence.

n. a reciprocal relation between interdependent entities (objects or individuals or groups)

"Otherwise, what we call interdependency is really counterdependency, in which people do the opposite to assert their independence, or co-dependency, in which they literally need the other person's weakness to fulfill their need and to justify their own weakness."

reciprocality    reciprocity   

interdependent   

parasitism    symbiosis    sharing    commensalism    mutualism