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Definition of reciprocal:
 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.
 Recurring in vicissitude; alternate.
 Reflexive;  applied to pronouns and verbs, but sometimes limited to such pronouns as express mutual action.
 That which is reciprocal to another thing.
 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.
 Used to denote different kinds of mutual relation; often with reference to the substitution of reciprocals for given quantities. See the Phrases below.
Synonyms:
inverse, commemorative, correlative, complementary, amateur, joint, requited, interactional, reciprocatory, retributive, maiden, desperate, lame, interchangeable, reciprocative, mutual, lamely, interactive, study at mutual, hostile, attempted, connect, avenging, supplementary, supplemental, exchangeable, vindicatory, reciprocal cross, twosided, reciprocating, common, facesaving, retaliative, retributory, retaliatory, limp, multiplicative inverse.

correlational (part of speech: adjective)
 correlational,
 interdependent,
 coactive,
 intertwined,
 interwoven,
 interlaced,
 correlated,
 interconnected,
 meshed,
 collaborative,
 dovetailed,
 intermeshed,
 merged,
 cooperational,
 interrelated,
 mutual,
 complementary,
 backandforth,
 interactive

mathematics (part of speech: noun)
 divisor,
 multiplicand,
 cube root,
 cube,
 modulus,
 algorithm,
 geometry,
 denominator,
 fraction,
 integral,
 root,
 multiplicator,
 quadratics,
 dividend,
 formula,
 exponent,
 quotient,
 differential calculus,
 square root,
 power,
 multiple,
 trigonometry,
 coefficient,
 calculus,
 arithmetic,
 multiplier,
 minuend,
 antilogarithm,
 subtrahend,
 factor,
 algebra,
 numerator,
 increment,
 logarithm,
 index,
 radix,
 algorithm
Usage examples:

43. " And must not to be separated and commingled, to grow cold and to grow warm, and every thing in the same manner, even though sometimes we have not names to designate them, yet in fact be everywhere thus circumstanced, of necessity, as to be produced from each other, and be subject to a reciprocal generation?"
 "Apology, Crito, and Phaedo of Socrates", Plato. 
Anna Campbell is not really in love with me: we are only like two friends, prepared to unite with each other in a conventional union, such as you may see many a couple around us enter upon an association of fortunes, in which the only personal sentiments demanded are reciprocal esteem.
 "French and Oriental Love in a Harem", Mario Uchard. 
That the fixed value of the money unit assumed is an absolute value, and not a mere " reciprocal of the price level," may be proved by some further considerations regarding relations among these same factors.
 "The Value of Money", Benjamin M. Anderson, Jr..