The definition of back-scratching refers to an exchange of favors.
The act or process of interchanging.
The act or an instance of exchanging:
Find another word for reciprocity. In this page you can discover 13 synonyms, antonyms, idiomatic expressions, and related words for reciprocity, like: back-scratching, interchange, mutuality, exchange, reciprocality, interdependence, complementarity, altruism, mutual understanding, interdependency and congruence.