Definitions from Wiktionary ( )

▸ noun:  One who uses or makes use of something, a consumer or client or an express or implied licensee (free user) or a trespasser.
▸ noun:  A person who uses drugs, especially illegal drugs.
▸ noun:  (computing) A person who uses a computer or a computing network, especially a person who has received a user account.
▸ noun:  (derogatory) An exploiter, an abuser (a person who exploits others, that is treats and regards people unfairly, selfishly or unethically).
▸ noun:  (law, dated) In land law, meaning either 1. or 2. above or use. Usually in singular form to mean use wherever there is assiduous re-use of precedents and aloof textbooks verbatim.
▸ noun:  (programming, slang) Someone who uses the R programming language.
▸ noun:  (Internet, informal) Clipping of username. [(computing) A name or string of characters used as a person's identification on an individual computer system.]

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