Reciprocity is a noun that refers to mutual benefit.

The Latin word reciprocus (ray CHEAP roe coos) means ‘returning the same way.’ Our word of the day may be used to describe a state where two or more people engage in behavior that helps everybody or ‘returns the same way’ for all. For example, After years of getting free tax advice from Shelly, I decided to repay her by coaching her son’s baseball team. She greatly appreciated the reciprocity.