conductor

noun

1. 1

   One who conducts or leads; a guide; a director.

2. 2

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

3. 3

   A person who takes tickets on public transportation and also helps passengers

   “train conductor; tram conductor”

4. 4

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

5. 5

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

6. 6

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

7. 7

   A leader.