- given or felt by each toward the other; mutual: reciprocal respect.
- given, performed, felt, etc., in return: reciprocal aid.
- corresponding; matching; complementary; equivalent: reciprocal privileges at other health clubs.
- Grammar. (of a pronoun or verb) expressing mutual relationship or action: “Each other” and “one another” are reciprocal pronouns.
- inversely related or proportional; opposite.
- Mathematics. noting expressions, relations, etc., involving reciprocals: a reciprocal function.
- Navigation. bearing in a direction 180° to a given direction; back.
- something that is reciprocal to something else; equivalent; counterpart; complement.
- Also called multiplicative inverse. Mathematics. the ratio of unity to a given quantity or expression; that by which the given quantity or expression is multiplied to produce unity: The reciprocal of x is 1/x.
- of, relating to, or designating something given by each of two people, countries, etc, to the other; mutualreciprocal friendship; reciprocal trade
- given or done in returna reciprocal favour
- (of a pronoun) indicating that action is given and received by each subject; for example, each other in the sentence they started to shout at each other
- maths of or relating to a number or quantity divided into one
- nautical denoting a course or bearing that is 180° from the previous or assumed one
- something that is reciprocal
- Also called: inverse maths a number or quantity that when multiplied by a given number or quantity gives a product of onethe reciprocal of 2 is 0.5
1560s, with -al (1) + stem of Latin reciprocus “returning the same way, alternating,” from pre-Latin *reco-proco-, from *recus (from re- “back;” see re-, + -cus, adjective formation) + *procus (from pro- “forward;” see pro-, + -cus. Related: Reciprocally. The noun meaning “that which is reciprocal” (to another) is from 1560s.
- Of or relating to a neuromuscular phenomenon in which the excitation of one group of muscles is accompanied by the inhibition of another.
- Of or being a pair of crosses in which the male parent in one cross is of the same genotype or phenotype as the female parent in the other cross.
- Either of a pair of numbers whose product is 1. For example, the number 3 is the reciprocal of 13.
The number by which a given number must be multiplied to get a result of one. The reciprocal of one-half, for example, is two.