reciprocal(redirected from reciprocality)
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1. Maths of or relating to a number or quantity divided into one
2. Navigation denoting a course or bearing that is 180? from the previous or assumed one
3. Maths a number or quantity that when multiplied by a given number or quantity gives a product of one
a number whose product with a given number is equal to 1. For example, 5 and 1/5 are mutually reciprocal, as are —2/3 and —3/2. For any number a that is not equal to 0 there exists the reciprocal 1/a.
The reciprocal of a number A is the number 1/ A.