# Reciprocal

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**Reciprocal** may refer to:

## In mathematics

- Multiplicative inverse, in mathematics, the number 1/
*x*, which multiplied by*x*gives the product 1, also known as a*reciprocal* - Reciprocal polynomial, a polynomial obtained from another polynomial by reversing its coefficients
- Reciprocal rule, a technique in calculus for calculating derivatives of reciprocal functions
- Reciprocal spiral: a plane curve
- Reciprocal averaging, a statistical technique for aggregating categorical data

## In science and technology

- Reciprocal aircraft heading, 180 degrees (the opposite direction) from a stated heading
- Reciprocal lattice, a basis for the dual space of covectors, in crystallography
- Reciprocal length, a measurement used in science
- Reciprocating engine or piston engine
- Reciprocating oscillation in physical wave theory

### Life sciences and medicine

- Hybrid (biology), in genetics, the result of a reciprocal pair of crossings, forming
*reciprocal hybrids* - Reciprocal altruism, a form of symbiotic relationship in evolutionary biology
- Reciprocal cross, a breeding experiment in genetics
- Sherrington's law of reciprocal innervation in the theory of muscle activation

### Social sciences

- Reciprocal determinism, a theory in psychology

### Linguistics

- Reciprocal construction, a construction in which agent and patient are in a mutual relationship

## In reciprocal relationships

- Reciprocal license, a type of software licenses also known as copyleft
- Reciprocal link between two web pages
- Reciprocal Public License (RPL), a software license

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