A user is someone who employs or uses a particular thing, like a user of nicotine or a user of an internet site. Since you are reading this, you are a user of Congrats!

To use something is to employ it or operate it, so a user is someone who uses or takes advantage of something. If you have a computer and use it for anything, you're a computer user. If you play a video game, you're a video game user. As you can see, this word often applies to technology. That's why they call the first part of a login the username. The people who design technology always have to keep the users in mind; it's important to make tech gadgets that are user-friendly.

Definitions of user

n a person who makes use of a thing; someone who uses or employs something

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a person who uses goods or services
end user
the ultimate user for which something is intended
someone who holds property by usufruct
utiliser, utilizer
someone who puts to good use
a person who wears or carries or displays something as a body covering or accessory
someone who chews (especially someone who chews tobacco)
concert-goer, music lover
someone who attends concerts
client, customer
someone who pays for goods or services
drinker, imbiber, juicer, toper
a person who drinks alcoholic beverages (especially to excess)
a person who drinks liquids
eater, feeder
someone who consumes food for nourishment
prodigal, profligate, squanderer
a recklessly extravagant consumer
smoker, tobacco user
a person who smokes tobacco
snuff user, snuffer
a person who uses snuff
Type of:
individual, mortal, person, somebody, someone, soul
a human being

n a person who uses something or someone selfishly or unethically

Type of:
selfish person
a person who is unusually selfish

n a person who takes drugs

drug user, substance abuser
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someone who is physiologically dependent on a substance; abrupt deprivation of the substance produces withdrawal symptoms
acid head
someone who takes LSD
caffein addict, caffeine addict
someone addicted to caffeine
drug addict, junkie, junky
a narcotics addict
hash head
a user of hashish
pill head
a consumer of amphetamine pills
someone who smokes marijuana habitually
speed freak
addict who habitually uses stimulant drugs (especially amphetamines)
Type of:
individual, mortal, person, somebody, someone, soul
a human being

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