From Longman Dictionary of Contemporary Englishuserus‧er /ˈjuːzə $ -ər/ ●●● S3 W1 noun [countable] 1 USE somethingsomeone or something that uses a product, service etc road users a computer user library users2 someone who takes illegal drugs Drug users were warned about the dangers of sharing needles. → end userCOLLOCATIONSADJECTIVES/NOUN + user computer usersComputer users are being warned to look out for the virus.road usersDid you signal to let other road users know you were turning right?business usersThe hotel caters mainly to business users.Internet usersInternet users who illegally download music and films could face large fines. a heavy user (=someone who uses something a lot)Electricity companies are warning that heavy users face much higher bills.a regular userRegular sunbed users are likely to suffer long-term skin damage.a light user (=someone who uses something only a little)Light users of the service will receive a reduction in their bill.
Examples from the Corpususer• There is a growing concern about the spread of AIDS among drug users.• According to founder and president Jim Ready, Xpert enables users to monitor the behaviour of code as its being written.• Computers are sold direct to end users as well as through dealers.• one of the heaviest users of fossil fuels in the world• A new information service will soon be available to library users.• First, screening rules are difficult to specify, given the vastly diverse needs of users.• Part of the increase in price will be passed on to private users.• Drunken drivers are a menace to themselves and other road users.• Some users however may experience temporary visual fatigue or have other concerns.• These facilities are sure to impress expert spreadsheet users, especially those with experience of Lotus 123.• The user can now evaluate the package to its full.• Software should be designed to be as accessible as possible to users.From Longman Business Dictionaryuserus‧er /ˈjuːzə-ər/ noun [countable] someone or something that uses a product or serviceComputer users can download the program and use it free of charge for 90 days. → end user → lead user