RECIPROCAL
\ɹɪsˈɪpɹəkə͡l], \ɹɪsˈɪpɹəkəl], \ɹ_ɪ_s_ˈɪ_p_ɹ_ə_k_əl]\
Definitions of RECIPROCAL
 2006  WordNet 3.0
 2010  New Age Dictionary Database
 1913  Webster's Revised Unabridged Dictionary
 1919  The Winston Simplified Dictionary
 1899  The american dictionary of the english language.
 1894  The Clarendon dictionary
 1919  The Concise Standard Dictionary of the English Language
 1914  Nuttall's Standard dictionary of the English language
 1874  Etymological and pronouncing dictionary of the English language
 1916  Appleton's medical dictionary
 1871  The Cabinet Dictionary of the English Language
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hybridization involving a pair of crosses that reverse the sexes associated with each genotype

(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

something (a term or expression or concept) that has a reciprocal relation to something else; "risk is the reciprocal of safety"

of or relating to the multiplicative inverse of a quantity or function; "the reciprocal ratio of a:b is b:a"

concerning each of two or more persons or things; especially given or done in return; "reciprocal aid"; "reciprocal trade"; "mutual respect"; "reciprocal privileges at other clubs"

of words or propositions so related that each is the negation of the other; "`male' and `female' are complementary terms"
By Princeton University

Recurring in vicissitude; alternate.

Done by each to the other; interchanging or interchanged; given and received; due from each to each; mutual; as, reciprocal love; reciprocal duties.

Mutually interchangeable.

Used to denote different kinds of mutual relation; often with reference to the substitution of reciprocals for given quantities. See the Phrases below.

That which is reciprocal to another thing.

Reflexive;  applied to pronouns and verbs, but sometimes limited to such pronouns as express mutual action.

The quotient arising from dividing unity by any quantity; thus, is the reciprocal of 4; 1 (a +b) is the reciprocal of a + b. The reciprocal of a fraction is the fraction inverted, or the denominator divided by the numerator.
By Oddity Software

Recurring in vicissitude; alternate.

Done by each to the other; interchanging or interchanged; given and received; due from each to each; mutual; as, reciprocal love; reciprocal duties.

Mutually interchangeable.

Used to denote different kinds of mutual relation; often with reference to the substitution of reciprocals for given quantities. See the Phrases below.

That which is reciprocal to another thing.

Reflexive;  applied to pronouns and verbs, but sometimes limited to such pronouns as express mutual action.

The quotient arising from dividing unity by any quantity; thus, is the reciprocal of 4; 1 (a +b) is the reciprocal of a + b. The reciprocal of a fraction is the fraction inverted, or the denominator divided by the numerator.
By Noah Webster.

Mutual; done, given, or offered by each to the other; as, reciprocal benefits; offered in return for something done or given; as, reciprocal conditions; in grammar, showing action upon, or relation of, each to the other; as, reciprocal pronouns (each other, one another).

That which is given or done by each to the other; the quotient obtained by dividing unity by a number.
By William Dodge Lewis, Edgar Arthur Singer

Acting in return: mutual: given and received.

That which is reciprocal: (math.) unity divided by any quantity.
By Daniel Lyons
By William Hand Browne, Samuel Stehman Haldeman
By James Champlin Fernald

Alternate; mutual; reflexive.

That which is reciprocal; the quotient that arises from dividing unity by a given number. Reciprocal ratio, the ratio between reciprocals of two quantities. Reciprocal terms, terms that have the same signification, and are mutually convertible.
By Nuttall, P.Austin.