Etymology
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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.

updated on September 29, 2012

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Definitions of user from WordNet

user (n.)
a person who makes use of a thing; someone who uses or employs something;
user (n.)
a person who uses something or someone selfishly or unethically;
Synonyms: exploiter
user (n.)
a person who takes drugs;
Synonyms: drug user / substance abuser
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.