reciprocal

Adjective

• of or relating to the multiplicative inverse of a quantity or function
  • the reciprocal ratio of a:b is b:a
    

• concerning each of two or more persons or things; especially given or done in return
  • reciprocal aid
    
  • reciprocal trade
    
  • mutual respect
    
  • reciprocal privileges at other clubs
    

Noun

• hybridization involving a pair of crosses that reverse the sexes associated with each genotype

• (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

• something (a term or expression or concept) that has a reciprocal relation to something else
  • risk is the reciprocal of safety
    

Related words

• Synonyms: 
  mutual , reciprocal cross , multiplicative inverse