Слово "reciprocal". Англо-русский словарь Мюллера

Cape Cod and Eddie’s company, Royal Crest, had worked out a useful and friendly reciprocal arrangement over the years.

There were few people about that day, and that few seemed bound together by a camaraderie of reciprocal esteem; they did nothing except sit rather glumly in their armchairs, drink occasionally, and exchange congratulations on not being seasick.

reciprocal understanding between brand and customers.

My sister is in the garden plucking the dead roses; my brother is reading his two papers, the Presse and the Debats, within six steps of her; for wherever you see Madame Herbault, you have only to look within a circle of four yards and you will find M. Emmanuel, and 'reciprocally,' as they say at the Polytechnic School."