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Topics referred to by the same term
Look up reciprocal in Wiktionary, the free dictionary. Reciprocal may refer to: Multiplicative inverse, in mathematics, the number 1/x, which multiplied
Reciprocal
Physical quantity
Reciprocal length or inverse length is a quantity or measurement used in several branches of science and mathematics, defined as the reciprocal of length
Reciprocal_length
Feeling attraction based on the other's affection
Reciprocal liking, also known as reciprocity of attraction, is the act of a person feeling an attraction to someone only upon learning or becoming aware
Reciprocal_liking
Fourier transform of a real-space lattice, important in solid-state physics
Reciprocal lattice is a concept associated with solids with translational symmetry which plays a major role in many areas such as X-ray and electron diffraction
Reciprocal_lattice
2025 economic policy by Donald Trump
ceremony, Trump signed Executive Order 14257, Regulating Imports With a Reciprocal Tariff to Rectify Trade Practices That Contribute to Large and Persistent
Liberation_Day_tariffs
Number which when multiplied by x equals 1
In mathematics, a multiplicative inverse or reciprocal for a number x, denoted by 1 x {\displaystyle {\tfrac {1}{x}}} or x−1, is a number which when multiplied
Multiplicative_inverse
The North American Reciprocal Museum (NARM) program is an affiliation of arts, historical, and cultural institutions in the United States, Canada, Mexico
North American Reciprocal Museum Association
North_American_Reciprocal_Museum_Association
Operation of opposing sets of muscles
Reciprocal inhibition is a neuromuscular process in which muscles on one side of a joint relax to allow the contraction of muscles on the opposite side
Reciprocal_inhibition
Type of agreement
In law, a reciprocal obligation, also known as a reciprocal agreement is a duty owed by one individual to another and vice versa. It is a type of agreement
Reciprocal_obligation
Form of behaviour between organisms
In evolutionary biology, reciprocal altruism is a behaviour whereby an organism acts in a manner that temporarily reduces its fitness while increasing
Reciprocal_altruism
Arrangement of construction beams
A reciprocal frame is a class of self-supporting structure made of three or more beams and which requires no center support to create roofs, bridges or
Reciprocal_frame
Sequence of numbers
The reciprocals of prime numbers have been of interest to mathematicians for various reasons. They do not have a finite sum, as Leonhard Euler proved
Reciprocals_of_primes
Theory in psychology on behavior
Reciprocal determinism is the theory set forth by psychologist Albert Bandura which states that a person's behavior both influences and is influenced by
Reciprocal_determinism
Instructional method
Reciprocal teaching is an instructional method designed to foster reading comprehension through collaborative dialogue between educators and students.
Reciprocal_teaching
Insurance type in the United States
A reciprocal inter-insurance exchange or simply a reciprocal in the United States is an unincorporated association in which subscribers exchange insurance
Reciprocal inter-insurance exchange
Reciprocal_inter-insurance_exchange
Cryptographic algorithm
plaintext. A reciprocal cipher is also sometimes referred as self-reciprocal cipher. Practically all mechanical cipher machines implement a reciprocal cipher
Symmetric-key_algorithm
Derivative method in calculus
In calculus, the reciprocal rule gives the derivative of the reciprocal of a function f in terms of the derivative of f. The reciprocal rule can be used
Reciprocal_rule
Search quality measure in information retrieval
The mean reciprocal rank is a statistic measure for evaluating any process that produces a list of possible responses to a sample of queries, ordered by
Mean_reciprocal_rank
Sexual activity that usually excludes penetration
Non-penetrative sex or outercourse is sexual activity that usually does not include sexual penetration, but some forms, particularly when termed outercourse
Non-penetrative_sex
Statistical distribution
proportional to the reciprocal of the variable. The reciprocal distribution is an example of an inverse distribution, and the reciprocal (inverse) of a random
Reciprocal_distribution
Graph of enzyme kinetics
In biochemistry, the Lineweaver–Burk plot (or double reciprocal plot) is a graphical representation of the Michaelis–Menten equation of enzyme kinetics
Lineweaver–Burk_plot
mathematics and number theory, the sum of reciprocals (or sum of inverses) is defined as the sum of reciprocals of some series of positive integers (counting
List_of_sums_of_reciprocals
Expression for proportional punishment
commandment found in the Book of Exodus 21:23–27 expressing the principle of reciprocal justice measure for measure. The earliest known use of the principle appears
Eye_for_an_eye
impose a 10% minimum "reciprocal tariff" on nearly all other countries, effective April 5, 2025. He also announced higher "reciprocal tariffs" for 57 countries
Tariffs in the second Trump administration
Tariffs_in_the_second_Trump_administration
Pronoun that indicates a relationship which is reciprocal
A reciprocal pronoun is a pronoun that indicates a reciprocal relationship. A reciprocal pronoun can be used for one of the participants of a reciprocal
Reciprocal_pronoun
Bidirectional parent-child socialization process
In sociology, reciprocal socialization "is a socialization process that is bidirectional; children socialize parents just as parents socialize children"
Reciprocal_socialization
Sentence with two or more simultaneous agents and patients
A reciprocal construction (abbreviated recp) is a grammatical pattern in which each of the participants occupies both the role of agent and patient with
Reciprocal_construction
Biological concept
biology, reciprocal causation arises when developing organisms are both products of evolution as well as causes of evolution. Formally, reciprocal causation
Reciprocal_causation
Primitive cell in the reciprocal space lattice of crystals
primitive cell in reciprocal space. In the same way the Bravais lattice is divided up into Wigner–Seitz cells in the real lattice, the reciprocal lattice is
Brillouin_zone
Polynomial with reversed root positions
+a_{n}x^{n},} with coefficients from an arbitrary field, its reciprocal polynomial or reflected polynomial, denoted by p∗ or pR, is the polynomial
Reciprocal_polynomial
Method of assisted reproduction
Partner-assisted reproduction, reception of oocytes from partner (ROPA), reciprocal IVF, shared motherhood, partner IVF or co-IVF is a method of family building
Partner-assisted_reproduction
Social media platform owned by Meta
Steven (October 2017). "Browsing, Posting, and Liking on Instagram: The Reciprocal Relationships Between Different Types of Instagram Use and Adolescents'
The Reciprocal Public License (RPL) is a software license released in 2001. Version 1.5 of the license was published on July 15, 2007, and was approved
Reciprocal_Public_License
Country in South Asia
century aimed to counter India's nuclear ambitions in the region, and reciprocal nuclear tests ensued after India's nuclear tests, solidifying Pakistan
Pakistan
Preservation of legal rights in the reuse of a work
certain patents. Copyleft software licenses are considered protective or reciprocal (in contrast with permissive free software licenses): they require that
Copyleft
Aspect of sociology and behavior
Reciprocal altruism in humans refers to an individual behavior that gives benefit conditionally upon receiving a returned benefit, which draws on the economic
Reciprocal_altruism_in_humans
1947 collective defense treaty
The Inter-American Treaty of Reciprocal Assistance (commonly known as the Rio Treaty, the Rio Pact, the Treaty of Reciprocal Assistance, or by the Spanish-language
Inter-American Treaty of Reciprocal Assistance
Inter-American_Treaty_of_Reciprocal_Assistance
Mass per unit volume
fluid, which causes it to rise relative to denser unheated material. The reciprocal of the density of a substance is occasionally called its specific volume
Density
Unit of frequency
The inverse second or reciprocal second (s−1), also called per second, is a unit defined as the multiplicative inverse of the second (a unit of time).
Inverse_second
Principle of pairs of opposing muscles
a model of reciprocal innervation (in 1626) as the principle that provides for the control of agonist and antagonist muscles. Reciprocal innervation
Reciprocal_innervation
Breeding experiment in genetics
In genetics, a reciprocal cross is a breeding experiment designed to test the role of parental sex on a given inheritance pattern. All parent organisms
Reciprocal_cross
Mathematical function
In mathematics, the reciprocal gamma function is the function f ( z ) = 1 Γ ( z ) , {\displaystyle f(z)={\frac {1}{\Gamma (z)}},} where Γ(z) denotes the
Reciprocal_gamma_function
In mathematics, the reciprocal difference of a finite sequence of numbers ( x 0 , x 1 , . . . , x n ) {\displaystyle (x_{0},x_{1},...,x_{n})} on a function
Reciprocal_difference
American political party
high Payne–Aldrich Tariff Act in 1910 caused a split in the party. The Reciprocal Tariff Act of 1934 marked a sharp departure from the era of protectionism
Republican Party (United States)
Republican_Party_(United_States)
Bilateral defense and security pact involving Japan
A reciprocal access agreement (RAA) (Japanese: 部隊間協力円滑化協定, lit. 'force-to-force cooperation facilitation agreement') refers to a bilateral defense and
Reciprocal_access_agreement
Disadvantage in a game due to obligation to move
the game for the defense: 1... Kc4!! Reciprocal zugzwang. 2. Nc3 Kb4 Reciprocal zugzwang again. 3. Kd3 Bg7 Reciprocal zugzwang again. 4. Kc2 Bh6 5. Kd3 Bg7
Zugzwang
Source-available software licensing scheme by Microsoft
for general use. Two of them, Microsoft Public License and Microsoft Reciprocal License, have been approved by the Open Source Initiative as open source
Shared_Source_Initiative
SI unit of frequency
units is 1/s or s−1, meaning that one hertz is one per second or the reciprocal of one second. It is used only in the case of periodic events. It is named
Hertz
United States criminal procedure
States criminal procedure, the Federal government and certain states have reciprocal discovery laws that compel defendants to disclose some information to
Reciprocal_discovery
Mathematical constant
The reciprocal Fibonacci constant ψ is the sum of the reciprocals of the Fibonacci numbers: ψ = ∑ k = 1 ∞ 1 F k = 1 1 + 1 1 + 1 2 + 1 3 + 1 5 + 1 8 +
Reciprocal_Fibonacci_constant
Relations between flows and forces, or gradients, in thermodynamic systems
In thermodynamics, the Onsager reciprocal relations express the equality of certain ratios between flows and forces in thermodynamic systems out of equilibrium
Onsager_reciprocal_relations
Angle between two objects
the opposite direction (180° apart) is also known as a reciprocal bearing; it forms a reciprocal line with the original bearing, e.g., the east-west line
Bearing_(navigation)
Country in Oceania
with New Zealand, the United Kingdom, Malaysia and Singapore; and the Reciprocal Access defence and security agreement with Japan. Australia has pursued
Australia
Agreement on Reciprocal Trade (formally the Agreement between the United States of America and the People's Republic of Bangladesh on Reciprocal Trade) is
2026 US–Bangladesh Reciprocal Trade Agreement
2026_US–Bangladesh_Reciprocal_Trade_Agreement
SI unit of amount of substance
constant (symbol NA) is given by the Avogadro number multiplied by the unit reciprocal mole (mol−1), i.e. NA = N0/mol. The ratio n = N/NA is a measure of the
Mole_(unit)
Formula in calculus
the composite of g with the reciprocal function, that is, the function that sends x to 1/x. The derivative of the reciprocal function is − 1 / x 2 {\displaystyle
Chain_rule
Algorithms for calculating square roots
non-square roots. The following are iterative methods for finding the reciprocal square root of S which is 1 / S {\displaystyle 1/{\sqrt {S}}} . Once it
Square_root_algorithms
Engine utilising one or more reciprocating pistons
A reciprocating engine, more often known as a piston engine, is a heat engine that uses one or more reciprocating pistons to convert high temperature and
Reciprocating_engine
President of the United States from 1961 to 1963
majorities. It authorized the president to negotiate tariff reductions on a reciprocal basis of up to 50 percent with the European Common Market. The legislation
John_F._Kennedy
Measure of the coldness of a system
statistical thermodynamics, thermodynamic beta, also known as coldness, is the reciprocal of the thermodynamic temperature of a system: β ≡ 1 k B T {\displaystyle
Thermodynamic_beta
UK successor to the European Health Insurance Card
of entitlement to the provision of healthcare services under the UK's reciprocal healthcare agreements with the European Union, Switzerland, Norway, Iceland
UK Global Health Insurance Card
UK_Global_Health_Insurance_Card
Social norm of reciprocating actions
preference to reciprocate social actions. Reciprocal actions differ from altruistic actions in that reciprocal actions tend to follow from others' initial
Reciprocity (social psychology)
Reciprocity_(social_psychology)
Topics referred to by the same term
Reciprocity (Canadian politics), free trade with the United States of America Reciprocal trade agreement, entered into in order to reduce (or eliminate) tariffs
Reciprocity
Efforts to increase the number of high-quality links pointing to a website
links to Bob's website, the websites are reciprocally linked. Website owners often submit their sites to reciprocal link exchange directories in order to
Link_building
Sum of inverse squares of natural numbers
the problem. The Basel problem asks for the precise summation of the reciprocals of the squares of the natural numbers, i.e. the precise sum of the infinite
Basel_problem
Type of synovial joint with concave, convex surfaces
articulation by reciprocal reception[citation needed]) is a type of synovial joint in which the opposing surfaces are reciprocally concave and convex
Saddle_joint
Type of machine powered saw
A reciprocating saw is a type of handheld, small, machine-powered saw, in which the cutting action is achieved through a push-and-pull ("reciprocating")
Reciprocating_saw
List of credit and debit card network alliances
Retrieved 23 August 2017. "1st September 2006 PULSE® AND LINK® NETWORKS SIGN RECIPROCAL ATM/CASH MACHINE AGREEMENT". LINK. Archived from the original on 23 August
Card_reciprocal_agreements
Penetrative sexual activity for reproduction or sexual pleasure
suggesting later marriage and reciprocal valuing of male and female virginity. The same pattern of late marriage and reciprocal valuing of virginity was reflected
Sexual_intercourse
Queen of the United Kingdom from 1837 to 1901
on the Field of the Cloth of Gold in 1520. When Louis Philippe made a reciprocal trip in 1844, he became the first French king to visit a British sovereign
Queen_Victoria
Behavior in social animals
Moreover, individuals closer in rank tend to groom each other more reciprocally than individuals further apart in rank. Grooming networks in black crested
Social_grooming
Phenomenon that results in unusual rearrangement of an chromosomes
translocation, with three main types: "reciprocal", "nonreciprocal" and "Robertsonian" translocation. Reciprocal translocation is a chromosome abnormality
Chromosomal_translocation
1934 United States tariff law
The Reciprocal Tariff Act (enacted June 12, 1934, ch. 474, 48 Stat. 943, 19 U.S.C. § 1351) provided for the negotiation of tariff agreements between the
Reciprocal_Tariff_Act
Railroad shipping practice
In railroad operations, reciprocal switching occurs when a customer served exclusively by one railroad company arranges for a different, nearby railroad
Reciprocal_switching
Spatial frequency of a wave
a physical quantity with dimension of reciprocal length, expressed in SI units of cycles per metre or reciprocal metre (m−1). Angular wavenumber, defined
Wavenumber
Analytic function in mathematics
formula can also be used to prove the stronger result that the sum of the reciprocals of the primes is infinite. On the other hand, combining that with the
Riemann_zeta_function
Proposed free trade agreement between the EU and the US
The Agreement on Reciprocal, Fair, and Balanced Trade, informally called the EU–US trade agreement, is a proposed trade agreement between the European
Agreement on Reciprocal, Fair, and Balanced Trade
Agreement_on_Reciprocal,_Fair,_and_Balanced_Trade
Policy on permits required to enter Chile
citizens from one of the visa-exempt countries. Chile generally maintains a reciprocal visa policy with other countries. Citizens of the following countries
Visa_policy_of_Chile
plans to urge Congress to pass a Trump Reciprocal Trade Act to bestow presidential authority to impose a reciprocal tariff on any country that imposed one
2024 United States presidential election
2024_United_States_presidential_election
Repetitive back-and-forth linear motion
Reciprocating motion, also called reciprocation, is a repetitive up-and-down or back-and-forth linear motion. It is found in a wide range of mechanisms
Reciprocating_motion
Inverse relationship between the intensity and duration
reducing duration and increasing light intensity, and vice versa. The reciprocal relationship is assumed in most sensitometry, for example when measuring
Reciprocity_(photography)
Word that substitutes for a noun or noun phrase
plural. Sub-types include personal and possessive pronouns, reflexive and reciprocal pronouns, demonstrative pronouns, relative and interrogative pronouns
Pronoun
Private social club in Washington, D.C.
(January 2018). "Cosmos Club Reciprocal Network – A North American Tour" (PDF). The Most Traveled. The Cosmos Club Reciprocal Club Expo. Retrieved March
Cosmos_Club
Ancient Greek concept of hospitality
patrons of foreigners. The rituals of hospitality created and expressed a reciprocal relationship between guest and host expressed in both material benefits
Xenia_(Greek)
One of the five 2D Bravais lattices
{a} _{1}|=|\mathbf {a} _{2}|=a.} The reciprocal lattice of the hexagonal lattice is a hexagonal lattice in reciprocal space with orientation changed by 90°
Hexagonal_lattice
Australian universal health insurance scheme
Medicare, as well as international visitors from 11 countries that have reciprocal agreements for medically necessary treatment. The Medicare Benefits Schedule
Medicare_(Australia)
Open-source hardware licence
by CERN. The licence comes in three variants: strongly reciprocal (CERN-OHL-S), weakly reciprocal (CERN-OHL-W), and permissive (CERN-OHL-P). The CERN OHL
CERN_Open_Hardware_Licence
Unit of measurement of optical power
dpt or D, is a unit of measurement with dimension of reciprocal length, equivalent to one reciprocal metre, 1 dpt = 1 m−1. It is normally used to express
Dioptre
The Uniform Reciprocal Enforcement of Support Act (URESA), passed in 1950, concerns interstate cooperation in the collection of spousal and child support
Uniform Reciprocal Enforcement of Support Act
Uniform_Reciprocal_Enforcement_of_Support_Act
First-century Jewish preacher and religious leader
discovery resonates well with the scholarly view that Jesus advocated reciprocal sharing among the destitute in that area of Galilee. Jesus was a Galilean
Jesus
Reciprocal silencing, a genetic phenomenon that primarily occurs in plants, refers to the pattern of redundant genes being silenced following a polyploid
Reciprocal_silencing
Group of European states without mutual border controls
agreement may only be concluded if the neighbouring state grants at least reciprocal rights to EEA and Swiss nationals resident on the Schengen side of the
Schengen_Area
American politician and lawyer (1925–1968)
Ikeda in Washington D.C. in 1961, President Kennedy promised to make a reciprocal visit to Japan in 1962, but the decision to resume atmospheric nuclear
Robert_F._Kennedy
Concept in modular arithmetic
considered an abuse of notation since it could be misinterpreted as the reciprocal of a {\displaystyle a} (which, contrary to the modular multiplicative
Modular multiplicative inverse
Modular_multiplicative_inverse
Number of rotations per unit time
frequency of rotation of an object around an axis. Its SI unit is the reciprocal seconds (s−1); other common units of measurement include the hertz (Hz)
Rotational_frequency
Unique point and line of a conic section
pole and polar are respectively a point and a line that have a unique reciprocal relationship with respect to a given conic section. Polar reciprocation
Pole_and_polar
Supreme leader of North Korea since 2011
dismantle North Korea's nuclear weapons facilities if the United States took reciprocal action. The two governments also announced that they would establish buffer
Kim_Jong_Un
Kolodny, Lora (May 28, 2025). "Federal trade court strikes down Trump's reciprocal tariffs". CNBC. Retrieved May 29, 2025. Knauth, Dietrich; Wiessner, Daniel;
List of executive orders in the second Trump presidency
List_of_executive_orders_in_the_second_Trump_presidency
Condition involving social and behavioral differences
in infancy. Difficulties may also be apparent in traditional forms of reciprocal social interaction, such as games like peek-a-boo or pat-a-cake, as well
Autism
Seattle recording studio
countless early acts of the genre utilizing the space, then widely known as Reciprocal Recording (1986–91). After several years as John & Stu's, the studio was
Hall_of_Justice_(studio)
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