The best replacement for reciprocal is inverse.

The best alternatives to reciprocal are rated as following:
★★★★★  inverse
★★  non reciprocal
★★  reflexive
★  mutual
★  reflexive french
★  reciprocate
★  multiplicative inverse
★  unilateral
  autogenic inhibition
  nonreciprocal translocation

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Speaking about reciprocal, one probably shouldn't forget about fractions.

Other search terms related to reciprocal and their ratings are:
★★★★★ fractions
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reciprocal
inverse
non reciprocal