reciprocals

'reciprocals'

[reciprocal.n.01] as in: something (a term or expression or concept) that has a reciprocal relation to something else

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Examples:
risk is the reciprocal of safety

'reciprocals'

[multiplicative_inverse.n.01] as in: (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

'reciprocals'

[reciprocal_cross.n.01] as in: hybridization involving a pair of crosses that reverse the sexes associated with each genotype