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user1

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

Origin of user1

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

user2

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

Origin of user2

noun use of Anglo-French user to use
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for user

user

noun
  1. law
    1. the continued exercise, use, or enjoyment of a right, esp in property
    2. a presumptive right based on long-continued useright of user
  2. (often in combination) a person or thing that usesa road-user
  3. informal a drug addict
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for user

n.

c.1400, agent noun from use (v.). Of narcotics, from 1935; of computers, from 1967. User-friendly (1977) is said in some sources to have been coined by software designer Harlan Crowder as early as 1972.

Online Etymology Dictionary, © 2010 Douglas Harper