A patron, a client; one who purchases or receives a product or service from a business or merchant, or intends to do so.
A native official who exacted customs duties.
A person, especially one engaging in some sort of interaction with others.
One who deals or metes out anything.
A particular type of stock broker or trader.
One who deals in goods, especially automobiles; a middleman.
A drug dealer, one who peddles illicit drugs.
The person who deals the cards in a card game.