Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 adj. Concerning each of two or more persons or things.
 adj. Interchanged, given, or owed to each other: reciprocal agreements to abolish customs duties; a reciprocal invitation to lunch.
 adj. Performed, experienced, or felt by both sides: reciprocal respect.
 adj. Interchangeable; complementary: reciprocal electric outlets.
 adj. Grammar Expressing mutual action or relationship. Used of some verbs and compound pronouns.
 adj. Mathematics Of or relating to the reciprocal of a quantity.
 adj. Physiology Of or relating to a neuromuscular phenomenon in which the excitation of one group of muscles is accompanied by the inhibition of another.
 adj. Genetics Of or designating a pair of crosses in which the male or female parent in one cross is of the same genotype or phenotype as the complementary female or male parent in the other cross.
 n. Something that is reciprocal to something else.
 n. Mathematics A number related to another in such a way that when multiplied together their product is 1. For example, the reciprocal of 7 is 1/7 ; the reciprocal of 2/3 is 3/2 .
from Wiktionary, Creative Commons Attribution/ShareAlike License
 adj. Of a feeling, action or such: mutual, uniformly felt or done by each party towards the other or others; twoway.
 adj. Something that is contrary or opposite.
 n. Of a number, the number obtained by dividing 1 by the given number; the result of exchanging the numerator and the denominator of a fraction.
from the GNU version of the Collaborative International Dictionary of English
 adj. Recurring in vicissitude; alternate.
 adj. Done by each to the other; interchanging or interchanged; given and received; due from each to each; mutual
 adj. Mutually interchangeable.
 adj. Reflexive;  applied to pronouns and verbs, but sometimes limited to such pronouns as express mutual action.
 adj. Used to denote different kinds of mutual relation; often with reference to the substitution of reciprocals for given quantities. See the Phrases below.
 n. That which is reciprocal to another thing.
 n. The quotient arising from dividing unity by any quantity; thus 1/4 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.
from The Century Dictionary and Cyclopedia
 Moving backward and forward; alternating; reciprocating.
 Mutually exchanged or exchangeable; concerning or given or owed by each (of two or more) with regard to the other or others: as, reciprocal aid; reciprocal rights, duties, or obligations; reciprocal love or admiration.
 Having an interchangeable character or relation; mutually equivalent or correspondent; concordant; agreeing.
 Synonyms Reciprocal, Mutual. There is a theoretical difference between these words, although it often is not important. That is mutual which is a common act on the part of both persons at the same time. Mutual is not properly applicable to physical acts or material things, as blows or gifts. Reciprocal means that one follows another, being caused by it, with emphasis upon that which is viewed as caused: as, reciprocal love or hate. See remarks under mutual as to the propriety of using mutual for common.
 n. That which is reciprocal to another thing.
 n. In mathematics, the quotient resulting from the division of unity by the quantity of which the quotient is said to be the reciprocal.
 In geometry, definitely dual, so that the dual of each element is fixed and constructible.
 n. In geometry, the dual.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 adj. of or relating to the multiplicative inverse of a quantity or function
 n. hybridization involving a pair of crosses that reverse the sexes associated with each genotype
 adj. concerning each of two or more persons or things; especially given or done in return
 n. (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
 n. something (a term or expression or concept) that has a reciprocal relation to something else
Etymologies
Examples

In what they described as a reciprocal move, progovernment Sunni forces partially lifted their border blockade on the main road link between Beirut and Damascus.

WOERTH: Right now, the new security director says that there's no limitations on what we call reciprocal jump seating.

WOERTH: Right now, the new security directives has additional limitations on what we call reciprocal jump seating.

Ted: Also, why did your violence not result in reciprocal and greater violence by your girlfriend, such as the use of a weapon?
The Volokh Conspiracy » A Crime to Repeatedly Insult a Minor

Also, why did your violence not result in reciprocal and greater violence by your girlfriend, such as the use of a weapon?
The Volokh Conspiracy » A Crime to Repeatedly Insult a Minor

Listed below are links to weblogs that reference Chutzpah in reciprocal space:

The other way in which a disposition to help can evolve requires that episodes of helping behavior are part of a longer term reciprocal strategy in which the organism that is the beneficiary of helping behavior is disposed to help its benefactor on some subsequent occasion.

For members of the inner group, the leadersubordinate dyadic exchange was seen as a partnership that was characterized by reciprocal influence; extracontractual behavior; mutual trust, respect, and liking; and a sense of a common fate.

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This is called reciprocal inhibition, and it is my recommendation.
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