Grabbed this off Google.
# Total Hits - Total number of requests sent to the server.
# Total Files - Total number of requests that resulted in a file being sent to the user.
# Total Pages - Total number of requested pages like html, htm, cgi, php, etc (not images or other files).
# Total Visits - Total number of single surfing sessions by any IP address.
# Total Kbytes - Total amount of data in kilobytes that was transferred.
# Total Unique Sites - Number of unique IP addresses that have made requests.
# Total Unique URLs - Different URLs from your site that were requested (by anyone).
# Total Referrers - Different external URLs that caused someone to access your site (like a link).
# Total Usernames - Number of different user names (like FTP user names).
# Total Unique User Agents - User agents are like versions of web browsers
What in specific do you want to know the meaning of?
There aren't any other threads that cover this, at least on these forums, that I know of.