noun

• A customer, a buyer or receiver of goods or services.
• (computing) The role of a computer application or system that requests and/or consumes the services provided by another having the role of server.
• A person who receives help or services from a professional such as a lawyer or accountant.
• (law) A person who employs or retains an attorney to represent him or her in any legal matter, or one who merely divulges confidential matters to an attorney while pursuing professional assistance without subsequently retaining the attorney.
• Short for client state. [A state that is economically, politically and/or militarily dependent on another, more powerful state. Originally, the realm of a client king of Rome.]