Princeton's WordNet

1. conductor, music director, director(noun)

   the person who leads a musical group

2. conductor(noun)

   a substance that readily conducts e.g. electricity and heat

3. conductor(noun)

   the person who collects fares on a public conveyance

4. conductor(noun)

   a device designed to transmit electricity, heat, etc.

Kernerman English Learner's Dictionary

1. conductor(noun)ənˈdʌk tər

   a person who leads an orchestra, band, or singers

   ***the orchestra's conductor

2. conductorənˈdʌk tər

   a person in charge of a train

   ***The conductor took our tickets.

Wiktionary

1. conductor(Noun)

   A person who conducts an orchestra, choir or other music ensemble; a professional whose occupation is conducting.

2. conductor(Noun)

   A person who takes tickets on public transportation

   train conductor

3. conductor(Noun)

   Something which can transmit electricity, heat, light or sound.

4. conductor(Noun)

   An ideal of a ring that measures how far it is from being integrally closed

Origin: From conductor.

Webster Dictionary

1. Conductor(noun)

   one who, or that which, conducts; a leader; a commander; a guide; a manager; a director

2. Conductor(noun)

   one in charge of a public conveyance, as of a railroad train or a street car

3. Conductor(noun)

   the leader or director of an orchestra or chorus

4. Conductor(noun)

   a substance or body capable of being a medium for the transmission of certain forces, esp. heat or electricity; specifically, a lightning rod

5. Conductor(noun)

   a grooved sound or staff used for directing instruments, as lithontriptic forceps, etc.; a director

6. Conductor(noun)

   same as Leader

The Standard Electrical Dictionary

1. Conductor

   In electricity, anything that permits the passage of an electric current. Any disturbance in the ether takes the form of waves because the ether has restitutive force or elasticity. In a conductor, on the other hand, this force is wanting; it opens a path through the ether and a disturbance advances through it from end to end with a wave front, but with no succession of waves. This advance is the beginning of what is termed a current. It is, by some theorists, attributed to impulses given at all points along the conductor through the surrounding ether, so that a current is not merely due to an end thrust. If ether waves preclude a current on account of their restitutive force, ether waves cannot be maintained in a conductor, hence conductors should be opaque to light, for the latter is due to ether waves. This is one of the more practical every day facts brought out in Clerk Maxwell's electromagnetic theory of light. The term conductor is a relative one, as except a vacuum there is probably no substance that has not some conducting power. For relative conducting power, tables of conductivity, q. v., should be consulted. The metals beginning with silver are the best conductors, glass is one of the worst. [Transcriber's note: See "ether" for contemporary comments on this now discarded concept.]

The Foolish Dictionary, by Gideon Wurdz

1. CONDUCTOR

   From Eng. _coin_, and Lat. _duco_, to command. One who commands the coin.

• geleider, geleidraadAfrikaans
• موصِل للحَرارَهArabic
• проводникBulgarian
• condutorPortuguese (BR)
• vodičCzech
• der LeiterGerman
• lederDanish
• αγωγόςGreek
• conductorSpanish
• juhtEstonian
• رساناFarsi
• johdinFinnish
• conducteurFrench
• מוֹלִיךHebrew
• ताप अथवा विद्युत चालकHindi
• vodičCroatian
• vezetőHungarian
• penghantarIndonesian
• leiðariIcelandic
• conduttoreItalian
• 伝導体Japanese
• 도체Korean
• laidininkasLithuanian
• vadītājsLatvian
• konduktorMalay
• geleiderDutch
• varmelederNorwegian
• przewodnikPolish
• رساناPersian
• رسوونكى له مس چې بريښنا رسوىPashto
• condutorPortuguese
• conductorRomanian
• проводникRussian
• vodičSlovak
• prevodnikSlovenian
• provodnikSerbian
• ledare, konduktorSwedish
• ตัวนำไฟฟ้าThai
• iletken (madde)Turkish
• 熱導管，電導體Chinese (Trad.)
• провідникUkrainian
• موصلUrdu
• chất dẫn (nhiệt, điện)Vietnamese
• 导体Chinese (Simp.)