definitions

# reciprocal

[ ri-sip-ruh-kuh l ]
/ rɪˈsɪp rə kəl /

### noun

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.

## Origin of reciprocal

1560–70; < Latin reciproc(us) returning, reciprocal + -al1

Related forms
Can be confusedmutual reciprocal (see synonym study at mutual)common mutual reciprocal (see usage note at mutual)

## Synonym study

1. See mutual.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for unreciprocal

## reciprocal

/ (rɪˈsɪprəkəl) /

### noun

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

## Word Origin for reciprocal

C16: from Latin reciprocus alternating

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for unreciprocal

## reciprocal

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.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for unreciprocal

## reciprocal

[ rĭ-sĭprə-kəl ]

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.

Science definitions for unreciprocal

## reciprocal

[ rĭ-sĭprə-kəl ]
Either of a pair of numbers whose product is 1. For example, the number 3 is the reciprocal of 13.