1 [yoo-zer]
a person or thing that uses.
one who uses drugs, especially as an abuser or addict.
Computers. a person who uses a computer.

1350–1400; Middle English usere; see use, -er1 Unabridged


2 [oo-zer]
noun Law.
the exercise of a right to the enjoyment of property.

noun use of Anglo-French user to use Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
user (ˈjuːzə)
1.  law
 a.  the continued exercise, use, or enjoyment of a right, esp in property
 b.  a presumptive right based on long-continued use: right of user
2.  (often in combination) a person or thing that uses: a road-user
3.  informal a drug addict

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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Computing Dictionary

user definition

1. Someone doing "real work" with the computer, using it as a means rather than an end. Someone who pays to use a computer. A programmer who will believe anything you tell him. One who asks silly questions without thinking for two seconds or looking in the documentation. Someone who uses a program, however skillfully, without getting into the internals of the program. One who reports bugs instead of just fixing them. See also luser, real user.
Users are looked down on by hackers to some extent because they don't understand the full ramifications of the system in all its glory. The term is relative: a skilled hacker may be a user with respect to some program he himself does not hack. A LISP hacker might be one who maintains LISP or one who uses LISP (but with the skill of a hacker). A LISP user is one who uses LISP, whether skillfully or not. Thus there is some overlap between the two terms; the subtle distinctions must be resolved by context.
2. Any person, organisation, process, device, program, protocol, or system which uses a service provided by others.
The term "client" (as in "client-server" systems) is rather more specific, usually implying two processes communicating via some protocol.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
It is the user that determines the matter, and particularly the user's habitual
  way of thinking.
Perhaps the solution lies in a more intimate exchange between user and software.
With these, and a pair of crutches for backup, a user can walk around.
Where the user of a search engine is on a solitary quest, the user of a
  collaborative-filtering system is part of a crowd.
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