reciprocally

(often followed by `for') in exchange or in reciprocation; "gave up our seats on the plane and in return received several hundred dollars and seats on the next plane out"; "we get many benefits in return for our taxes"

in a mutual or shared manner; "the agreement was mutually satisfactory"; "the goals of the negotiators were not reciprocally exclusive"

in an inverse or contrary manner; "inversely related"; "wavelength and frequency are, of course, related reciprocally"- F.A.Geldard