interchange (part of speech: noun)
- This reciprocity of infinitude forms their life. - "Seraphita", Honore de Balzac.
- They also had their feuds and alliances with the inferior chieftains, and in peaceful times there was also a reciprocity of obligations between them. - "Irish Race in the Past and the Present", Aug. J. Thebaud.
- He that has fears his blotches may offend Speaks gently of the pimples of his friend: For reciprocity exacts her dues, And they that need excuse must needs excuse. - "The Satires, Epistles, and Art of Poetry", Horace a.k.a. Quintus Horatius Flaccus Translated by John Conington, M. A..