Re·cip·ro·cal·ly 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.
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