A purchaser of goods or services. In early use: spec. a person who regularly purchases from a particular business.

Scottish. A customer. Obsolete.

A person who supports or frequents a business or other institution; a customer of a shop, restaurant, theatre, etc.

A person that one has to do with; a ‘customer’.

Scottish. A buyer, purchaser; a customer. Also figurative.

gen. A person using the services of a professional person or organization; a customer of a person or organization offering services.

cant and colloquial. Chiefly U.S. Among fairground and carnival workers: a member of the public, a customer.

colloquial. A customer, a client; (sometimes) spec. a prostitute's client.