Conductor or conduction may refer to:

Music

Conductor (music) Conducting is the art of directing a musical performance, such as an orchestral or Choir, choral concert. It has been defined as "the art of directing the simultaneous performance of several players or singers by the use of gesture." The primary ...

, a person who leads a musical ensemble, such as an orchestra. * ''Conductor'' (album), an album by indie rock band The Comas * Conduction, a type of structured free improvisation in music notably practiced by Butch Morris

Mathematics

* Conductor (ring theory), an ideal of a ring that measures how far it is from being integrally closed * Conductor of an abelian variety, a description of its bad reduction * Conductor of a Dirichlet character, the natural (smallest) modulus for a character *

Conductor (class field theory) In algebraic number theory, the conductor of a finite abelian extension of local or global fields provides a quantitative measure of the ramification in the extension. The definition of the conductor is related to the Artin map. Local conductor ...

, a modulus describing the ramification in an abelian extension of local or global fields *

Artin conductor In mathematics, the Artin conductor is a number or ideal associated to a character of a Galois group of a local or global field, introduced by as an expression appearing in the functional equation of an Artin L-function. Local Artin conductors ...

, an ideal or number associated to a representation of a Galois group of a local or global field * Conductor of a

numerical semigroup In mathematics, a numerical semigroup is a special kind of a semigroup. Its underlying set is the set of all nonnegative integers except a finite number and the binary operation is the operation of addition of integers. Also, the integer 0 must b ...

, the smallest integer in the semigroup such that all subsequent integers are likewise in the semigroup

Physics

Electrical conductor In physics and electrical engineering, a conductor is an object or type of material that allows the flow of charge (electric current) in one or more directions. Materials made of metal are common electrical conductors. Electric current is gene ...

, an object, substance or material allowing the flow of an electric charge ** Electrical resistivity and conductivity, the movement of charged particles through an electrical conductor ** Electrical resistance and conductance **

Fast ion conductor In materials science, fast ion conductors are solid conductors with highly mobile ions. These materials are important in the area of solid state ionics, and are also known as solid electrolytes and superionic conductors. These materials are usef ...

, a solid-state electrical conductor which conducts due to the movement of ions ** Mixed conductor, a solid state electrical conductor which conducts due to the movement of ions and electrons **

Electrical conduction system of the heart The cardiac conduction system (CCS) (also called the electrical conduction system of the heart) transmits the signals generated by the sinoatrial node – the heart's pacemaker, to cause the heart muscle to contract, and pump blood through ...

* Thermal conduction, the transfer of thermal energy through matter **

Thermal conductivity The thermal conductivity of a material is a measure of its ability to conduct heat. It is commonly denoted by k, \lambda, or \kappa. Heat transfer occurs at a lower rate in materials of low thermal conductivity than in materials of high thermal ...

* Optical conductor, such as

Optical fiber An optical fiber, or optical fibre in Commonwealth English, is a flexible, transparent fiber made by drawing glass ( silica) or plastic to a diameter slightly thicker than that of a human hair. Optical fibers are used most often as a mea ...

Transport

* Bus conductor, a person who checks passengers' tickets on a bus *

Conductor (rail) A conductor ( North American English) or guard (Commonwealth English) is a train crew member responsible for operational and safety duties that do not involve actual operation of the train/locomotive. The ''conductor'' title is most common in No ...

, a captain of the crew of a train *

Conductor (underground railroad) The Underground Railroad was a network of clandestine routes and safe houses established in the United States during the early- to mid-19th century. It was used by enslaved African Americans primarily to escape into free states and Canada. T ...

, an operative of the ''Underground Railroad'' of the antebellum-era United States which guided slaves to freedom * Mr. Conductor, a character in ''Shining Time Station'' and in ''Thomas and the Magic Railroad''

Other uses

* Conductor (architecture), a traditional name for a downspout * Conductor (company), a provider of SEO services platforms based in New York City * Conductor (military appointment), a senior Warrant Officer appointment in the Royal Logistic Corps and its predecessors * Conductor (software), a microservice orchestration system developed by Netflix * The Conductor (film), ''The Conductor'' (film), a 2012 Russian film by Pavel Lungin * Part of the palpal bulb of male spiders * In biology, the conductor of a recessive gene or genetic carrier * ''The Orchestra Conductor'' aka ''The Conductor'', a 1980 Polish film by Andrzej Wajda * A special education teacher who can applies the methods of conductive pedagogy {{Disambiguation