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Conductor or conduction may refer to:
- Electrical conductor, an object allowing the flow of electric charge
- Electrical conduction, the movement of charged particles through an electrical conductor
- Fast ion conductor, a solid-state electrical conductor which conducts due to the movement of ions
- Conduction (heat), the transfer of thermal energy through matter
- Electrical conduction system of the heart
- Conductor (music), a person who leads a musical ensemble by way of visible gestures known as conducting
- Conductor (album), an album by indie rock band The Comas
- Conduction, a type of structured free improvisation in music notably practiced by Butch Morris
- Conductor (transportation), a person who sells and checks tickets on a bus, train, etc.
- Conductor (architecture), a traditional name for a downspout
- Conductor (Army), a senior Warrant Officer appointment in the Royal Logistic Corps and its predecessors
- Conductor (underground railroad), an operative of the Underground Railroad of the 19th century United States helping move slaves to freedom
- Mr. Conductor, a character in Shining Time Station and in Thomas and the Magic Railroad
- 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), a modulus describing the ramification in an abelian extension of local or global fields
- Artin conductor, an ideal or number associated to a representation of a Galois group of a local or global field
- In the theory of numerical semigroups, the conductor of a numerical semigroup (also called the Frobenius number of the semigroup) is the greatest integer not in the semigroup.
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