a person or group that uses the professional advice or services of a lawyer, accountant, advertising agency, architect, etc.
a person who is receiving the benefits, services, etc., of a social welfare agency, a government bureau, etc.
a customer.
anyone under the patronage of another; a dependent.
Computers. a workstation on a network that gains access to central data files, programs, and peripheral devices through a server.
(in ancient Rome) a plebeian who lived under the patronage of a patrician.
being a regular customer: a client company.
economically, and often militarily, dependent upon a more prosperous, more powerful nation.

1350–1400; Middle English < Latin client-, stem of cliēns person seeking the protection or influence of someone powerful; perhaps akin to clīnāre to bend (see incline)

cliental [klahy-en-tl, klahy-uhn-tl] , adjective
nonclient, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
client (ˈklaɪənt)
1.  a person, company, etc, that seeks the advice of a professional man or woman
2.  a customer
3.  a person who is registered with or receiving services or financial aid from a welfare agency
4.  computing a program or work station that requests data or information from a server
5.  a person depending on another's patronage
[C14: from Latin cliēns retainer, dependant; related to Latin clīnāre to lean]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1393, from Anglo-Fr. clyent, from L. cliens (acc. clientem) "follower, retainer," perhaps a var. of prp. of cluere "listen, follow, obey" (see listen); or from clinare "to incline, bend," from suffixed form of PIE base *klei- "to lean" (see
lean (v.)). The ground sense is of one who leans on another for protection. In ancient Rome, a plebian under protection of a patrician (in this relationship called patronus, see patron), originally in Eng. "a lawyer's customer," by c.1600 extended to any customer.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
client   (klī'ənt)  Pronunciation Key 
A program that runs on a personal computer or workstation connected to a computer network and requests information from a file server.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

client definition

A computer system or process that requests a service of another computer system or process (a "server") using some kind of protocol and accepts the server's responses. A client is part of a client-server software architecture.
For example, a workstation requesting the contents of a file from a file server is a client of the file server.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
She provides tactical direction, cultivates client relationships, business
  alliances and guides the customer experience.
It's the flip side of the client making unrealistic demands.
These can easily be filed by case and client, so the client gets a more
  detailed invoice.
In this example you can see the normal process of recovery from trauma
  reflected in the client s dreams.
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