1. A person, etc. who conducts, leads, guides, etc.; one who leads, guides, or escorts; a leader, guide.
2. The director of an orchestra or chorus, who indicates to the performers the rhythm, expression, etc., of the music by motions of a baton or of the hands.
3. An official who has charge of the passengers, collects fares, and generally directs the proceedings, on an omnibus, tram, or a railroad train.
4. Anything that conducts, leads, or guides; a channel by which water, etc. is conducted.
5. A substance having the property of conducting or permitting the passage of heat, electricity, or other form of energy.
6. A device or arrangement (e.g. a wire, rod, or the like) for conducting electricity; that part of a cable, etc., by which the electricity is conducted.