Correlation (Double or reciprocal relation)
Nouns
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reciprocalness etc. adj.
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reciprocity, reciprocation
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mutuality, correlation, interdependence, interrelation, connection, link, association
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interchange etc. [Double or mutual change.] Interchange
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exchange, barter. reciprocator, reprocitist.
Adjectives
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reciprocal, mutual, commutual, correlative, reciprocative, interrelated, closely related
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alternate
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interchangeable
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interdependent
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international
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complemental, complementary.
Phrases
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happy in our mutual help" [Milton].