Reciprocally

adv.	1.	In a reciprocal manner; so that each affects the other, and is equally affected by it; interchangeably; mutually. These two particles do reciprocally affect each other with the same force. - Bentley.
	2.	(Math.) In the manner of reciprocals. Reciprocally proportional (Arith. & Alg.) proportional, as two variable quantities, so that the one shall have a constant ratio to the reciprocal of the other.

Adv.	1.	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" Synonyms: in return
	2.	reciprocally - in a mutual or shared manner; "the agreement was mutually satisfactory"; "the goals of the negotiators were not reciprocally exclusive" Synonyms: mutually
	3.	reciprocally - in an inverse or contrary manner; "inversely related"; "wavelength and frequency are, of course, related reciprocally"- F.A.Geldard Synonyms: inversely

in return, mutual, reciprocal