client

noun

• 1a person or organization using the services of a lawyer or other professional person or company:insurance tailor-made to a client’s specific requirements
• a person receiving social or medical services:a client referred for counseling
• (also client state) a nation that is dependent on another, more powerful nation.

• 2 Computing (in a network) a desktop computer or workstation that is capable of obtaining information and applications from a server.
• (also client application or program) a program that is capable of obtaining a service provided by another program.

• 3(in ancient Rome) a plebeian under the protection of a patrician.
• archaic a dependent; a hanger-on.