# Dictionary Definition

reciprocal adj

1 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" [syn: mutual] [ant: nonreciprocal]

2 of or relating to or suggestive of
complementation; "interchangeable electric outlets" [syn: complementary, interchangeable]

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

### Noun

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

2 (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 [syn: multiplicative
inverse]

3 hybridization involving a pair of crosses that
reverse the sexes associated with each genotype [syn: reciprocal
cross]

# User Contributed Dictionary

## English

### Pronunciation

### Adjective

reciprocal- Of an action, feeling, etc, done, felt, etc, by each of two people to, on or towards the other.
- In the contrary or opposite way, order, or direction

#### Translations

done by each of two people towards the other

- Danish: reciprok
- Finnish: vastavuoroinen
- French: réciproque and
- German: gegenseitig
- Portuguese: recíproco , recíproca
- Spanish: mutuo

in the contrary or opposite way

- Finnish: päinvastainen
- German: entgegengesetzt, umgekehrt
- Spanish: al revés

### Noun

- 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.
- 0.5 is the reciprocal of 2.

#### Synonyms

- (in arithmetic): multiplicative inverse

#### Translations

in mathematics

### Related terms

# Extensive Definition

Reciprocal may refer to:

- Multiplicative inverse, in mathematics, the number 1/x, which multiplied by x gives the product 1, also known as a reciprocal
- Reciprocal rule, a technique in calculus for calculating derivatives of reciprocal functions
- Reciprocal lattice, a basis for the dual space of covectors, in crystallography
- Reciprocal (grammar), a relationship between grammatical agents
- Reciprocal determinism, a theory in psychology
- Reciprocal altruism, a form of symbiotic relationship in evolutionary biology
- Reciprocal cross, a breeding experiment in genetics
- Hybrid (biology), in genetics, the result of reciprocal crossing, also known as a reciprocal hybrid

### See also

# Synonyms, Antonyms and Related Words

algorismic, algorithmic, aliquot, ally, alter ego, alternate, analogon, analogous, analogue, answering, associate, associated, back-and-forth,
beating, brother, cardinal, changeable, circling, close copy, close
match, coacting,
coactive, coadjutant, coadjuvant, coefficient, coequal, cognate, collaborative, collective, collectivist, collectivistic, collusive, combined, commensal, common, communal, communalist, communalistic, communist, communistic, communitarian, commutable, commutative, commutual, companion, compensatory, complement, complemental, complementary, concerted, concordant, concurrent, concurring, congenator, congener, conjoint, conniving, convertible, cooperant, cooperating, cooperative, coordinate, correlate, correlative, correspondent, corresponding, counterpart, cyclic, decimal, differential, digital, double, duplicate, ecumenic, epochal, equal, equalizing, equipollent, equivalent, even, every other, exchanged, exponential, fellow, figural, figurate, figurative, finite, fractional, general, give-and-take, harmonious, harmonized, homologous, image, imaginary, impair, impossible, in common,
infinite, integral, interchangeable,
interchanged,
intermittent,
irrational, isochronal, joint, kindred spirit, like, likeness, logarithmic, logometric, match, mate, measured, metronomic, mutual, near duplicate, negative, noncompetitive, numeral, numerary, numerative, numeric, obverse, odd, ordinal, oscillatory, pair, parallel, pendant, periodical, permutable, picture, popular, positive, possible, prime, public, pulsing, punitive, radical, rational, real, reciprocating, reciprocative, recompensing, recompensive, recurrent, recurring, reparative, restitutive, retaliative, retaliatory, retributive, retributory, returnable, rhythmic, rotary, seasonal, second self, seesaw, serial, shared, similitude, simulacrum, sine wave,
sister, social, socialistic, societal, soul mate, standard, steady, submultiple, such, suchlike, surd, swapped, switched, symbiotic, synergetic, synergic, synergistic, tally, tantamount, the like of, the
likes of, to-and-fro, traded, transcendental, transposed, twin, uncompetitive, undulant, undulatory, up-and-down,
wavelike, wheeling