• Party to a contract who commissions the work. On capital projects, may also be referred to as the "owner".
  • Customer, principal, owner, promoter, buyer, or end-user of the product or service created by the project.



  • (written as Client)
    A customer of a corporation or an individual service provider, such as a broker or an investment bank. Clients of foreign exchange brokerages rely upon these firms to execute transactions, provide access to research and analysis, and to manage investment accounts.

Information & Library Science

  • noun a person using the services of a professional organisation
  • noun a computer that is connected to a network or the Internet, or that is using the resources of another computer.


  • noun a person who pays for a service carried out by a professional person such as an accountant or a solicitor


  • noun a person visited by a health visitor or social worker


  • noun somebody with whom business is done, or somebody who pays for a service

Origin & History of “client”

The original status of a client was rather lowly: he was someone who was at another’s beck and call, and dependent on them. The word comes from Latin cliēns, an alteration of an earlier cluēns, the present participle of the verb cluēre ‘listen, follow, obey’; hence someone who was cliēns was always listening out for another’s orders, unable to take independent action (in ancient Rome it meant specifically a plebeian under the protection of a nobleman). that sense is preserved in such English expressions as ‘client state’. The word’s more modern senses have developed through ‘person on whose behalf a lawyer acts’ in the 15th century to simply ‘customer’ in the 17th century.