Definition of users:
(n) :
One who uses or makes use of something, a consumer or client or an express or implied licensee (free user) or a trespasser.
(n) :
(computing) A person who uses a computer or a computing network, especially a person who has received a user account.
(n) :
A person who uses drugs, especially illegal drugs.
(n) :
(derogatory) An exploiter, an abuser (a person who exploits others, that is treats and regards people unfairly, selfishly or unethically).
(n) :
(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.
(n) :
(programming, slang) Someone who uses the R programming language.