getting even, paying back, return - a reciprocal group action; "in return we gave them as good as we got"

movement, motility, motion, move - a change of position that does not entail a change of location; "the reflex motion of his eyebrows revealed his surprise"; "movement is a sign of life"; "an impatient move of his hand"; "gastrointestinal motility"

interaction - a mutual or reciprocal action; interacting

reciprocity - mutual exchange of commercial or other privileges

cross-fertilisation, cross-fertilization - interchange between different cultures or different ways of thinking that is mutually productive and beneficial; "the cross-fertilization of science and the creative arts"

dealings, traffic - social or verbal interchange (usually followed by `with')