One who, or that which, conducts; a leader; a commander; a guide; a manager; a director.
- One who conducts, especially:
- One who is in charge of a railroad train, bus, or streetcar.
- Music One who directs an orchestra or other such group.
- Physics A substance or medium that conducts heat, light, sound, or especially an electric charge.
- A lightning rod, as on a house or barn.