a person who conducts; a leader, guide, director, or manager.
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.
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.
a substance, body, or device that readily conducts heat, electricity, sound, etc.: Copper is a good conductor of electricity.

1400–50; < Latin (see conduce, -tor); replacing late Middle English cond(u)itour < Anglo-French, equivalent to Middle French conduiteur < Latin as above; see conduit

conductorial [kon-duhk-tawr-ee-uhl, -tohr-] , adjective
conductorship, noun
multiconductor, adjective
preconductor, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
conductor (kənˈdʌktə)
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
fem n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1481, "one who leads or guides," conduitour, from O.Fr. conduitor, from L. conductorem, agent noun from conducere (see conduce). 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,
Amer.Eng. Physics sense of "object or device that passes heat" is from 1745; of electricity from 1737.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

conductor con·duc·tor (kən-dŭk'tər)

  1. A substance or medium that conducts heat, light, sound, or especially an electric charge.

  2. An instrument or probe having a groove along which a knife is passed in slitting open a sinus or fistula; a grooved director.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
conductor  [%PREMIUM_LINK%]     (kən-dŭk'tər)  Pronunciation Key 
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.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

conductor definition

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.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Upon these my conductors seated themselves, signing for me to do likewise.
Her strongly interpretive playing has made her a favorite among many conductors
  and reviewers.
Other people claim that the dullness of opera is due to the conductors.
We're on the open road now, without conductors and timetables.
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