#12. [Double or reciprocal relation.] Correlation. -- N. reciprocalness &c. adj[obs3].; reciprocity, reciprocation; mutuality, correlation, interdependence, interrelation, connection, link, association; interchange &c. 148; exchange, barter.
reciprocator, reprocitist.
V. reciprocate, alternate; interchange &c. 148; exchange; counterchange[obs3].
Adj. reciprocal, mutual, commutual[obs3], correlative, reciprocative, interrelated, closely related; alternate; interchangeable; interdependent; international; complemental, complementary.
Adv. mutually, mutatis mutandis[Lat]; vice versa; each other, one another; by turns &c. 148; reciprocally &c. adj.
Phr. " happy in our mutual help " [Milton].