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English definition of “unique user”

unique user

noun [C, usually plural]     (also unique visitor)
IT, INTERNET, MARKETING someone who looks at a website one or more times in a particular period of time, and who can be recognized by the address of their computer. Counting the number of unique users of a website, rather than the total number of visits to the website is a way of measuring how popular it is: Last year, site traffic increased by 92%, to 849,000 unique users.
(Definition of unique user noun from the Cambridge Business English Dictionary © Cambridge University Press)
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