Reciprocality

[ri-sip-ruh-kuh l] /rɪˈsɪp rə kəl/

adjective
1.
given or felt by each toward the other; mutual:
reciprocal respect.
2.
given, performed, felt, etc., in return:
reciprocal aid.
3.
corresponding; matching; complementary; equivalent:
reciprocal privileges at other health clubs.
4.
Grammar. (of a pronoun or verb) expressing mutual relationship or action:
“Each other” and “one another” are reciprocal pronouns.
5.
inversely related or proportional; opposite.
6.
Mathematics. noting expressions, relations, etc., involving reciprocals:
a reciprocal function.
7.
Navigation. bearing in a direction 180° to a given direction; back.
noun
8.
something that is reciprocal to something else; equivalent; counterpart; complement.
9.
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.
/rɪˈsɪprəkəl/
adjective
1.
of, relating to, or designating something given by each of two people, countries, etc, to the other; mutual: reciprocal friendship, reciprocal trade
2.
given or done in return: a reciprocal favour
3.
(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
4.
(maths) of or relating to a number or quantity divided into one
5.
(nautical) denoting a course or bearing that is 180° from the previous or assumed one
noun
6.
something that is reciprocal
7.
(maths) Also called inverse. a number or quantity that when multiplied by a given number or quantity gives a product of one: the reciprocal of 2 is 0.5
adj.

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.

reciprocal re·cip·ro·cal (rĭ-sĭp’rə-kəl)
adj.

reciprocal
(rĭ-sĭp’rə-kəl)
Either of a pair of numbers whose product is 1. For example, the number 3 is the reciprocal of 1/3 .

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.