Conductor

[kuh n-duhk-ter] /kənˈdʌk tər/

noun
1.
a person who ; a leader, guide, director, or manager.
2.
an employee on a bus, train, or other public conveyance, who is in charge of the conveyance and its passengers, collects fares or tickets, etc.
3.
a person who directs an orchestra or chorus, communicating to the performers by motions of a baton or the hands his or her interpretation of the music.
4.
a substance, body, or device that readily heat, electricity, sound, etc.:
Copper is a good conductor of electricity.
5.
.
/kənˈdʌktə/
noun
1.
an official on a bus who collects fares, checks tickets, etc
2.
Also called (esp US) director. a person who conducts an orchestra, choir, etc
3.
a person who leads or guides
4.
(US & Canadian) a railway official in charge of a train
5.
a substance, body, or system that conducts electricity, heat, etc
6.
See lightning conductor
n.

1520s, “one who leads or guides,” from Middle French conductour (14c., Old French conduitor), from Latin conductor “one who hires, contractor,” in Late Latin “a carrier,” from conductus, past participle of conducere (see conduce).

Earlier in same sense was conduitour (early 15c., from Old French conduitor). Meaning “leader of an orchestra or chorus” is from 1784; meaning “one who has charge of passengers and collects fares on a railroad” is 1832, American English. Physics sense of “object or device that passes heat” is from 1745; of electricity from 1737.

conductor con·duc·tor (kən-dŭk’tər)
n.

conductor
(kən-dŭk’tər)
A material or an object that conducts heat, electricity, light, or sound. Electrical conductors contain electric charges (usually electrons) that are relatively free to move through the material; a voltage applied across the conductor therefore creates an electric current. Insulators (electrical nonconductors) contain no charges that move when subject to a voltage. Compare insulator. See also resistance, superconductivity.

A material through which electric current can pass. In general, metals are good conductors. Copper or aluminum is normally used to conduct electricity in commercial and household systems. (Compare insulator.)