reciprocal

Adjective
  1. Concerning each of two or more persons or things;
    Especially given or done in return (synset 301952167)
    "reciprocal aid"; "reciprocal trade"; "mutual respect"; "reciprocal privileges at other clubs"
  2. Of or relating to the multiplicative inverse of a quantity or function (synset 300773320)
    "the reciprocal ratio of a:b is b:a"
Noun
  1. Something (a term or expression or concept) that has an inverse relation to something else (synset 113865800)
    "risk is the reciprocal of safety"
  2. (mathematics) one of a pair of numbers whose product is 1: the reciprocal of 2/3 is 3/2;
    The multiplicative inverse of 7 is 1/7 (synset 113865372)
  3. Hybridization involving a pair of crosses that reverse the sexes associated with each genotype (synset 100852776)

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