"reciprocals" in the noun sense
something (a term or expression or concept) that has an inverse relation to something else
"risk is the reciprocal of safety"
2. multiplicative inverse, reciprocal
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
3. reciprocal cross, reciprocal
hybridization involving a pair of crosses that reverse the sexes associated with each genotype
Source: WordNet® (An amazing lexical database of English)
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