Mutual or reciprocal relation or relatedness:
— Interrelationships of animal structure and function.

synonyms: interrelatedness, interrelationship.

Roget 12: reciprocalness etc. adj.^†; reciprocity, reciprocation; mutuality, correlation, interdependence, interrelation, connection, link, association; interchange etc. 148; exchange, barter.    reciprocator, reprocitist.    ... show more

Dutch: verwevenheid