(1):

(n.) A peculiar person; - in an indefinite sense; as, a queer customer; an ugly customer.

(2):

(n.) One who collect customs; a toll gatherer.

(3):

(n.) A lewd woman.

(4):

(n.) A person with whom a business house has dealings; as, the customers of a bank.

(5):

(n.) One who regularly or repeatedly makes purchases of a trader; a purchaser; a buyer.