
Unique visitors refers to the number of distinct individuals requesting pages from the website during a given period, regardless of how often they visit. (Visits refers to the number of times a site is visited, no matter how many unique visitors make up those sessions.) When an individual goes to a website on Tuesday, then again on Wednesday, this...
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http://en.wikipedia.org/wiki/Unique_visitor

A site audience measurement unit. A specific visitor (identified through his IP address) who has visited a site during a whole month.
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http://www.encyclo.co.uk/local/20441

Detected by unique addresses visiting a site for the first time in a specified period (usually one day), so that user visits are not recorded twice. While unique visitor counts can show the size of a site's audience, they cannot show how visitors use the site. vnunet.com uses WebTrendsLive to measure site traffic.
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http://www.encyclo.co.uk/local/20469

Describes a person who visits a website, as one unit, even if they have made several visits to the same site in a particular period of time, usually 24 hours
Found on
http://www.encyclo.co.uk/local/22643
No exact match found.