Thanks for posting at TopHostingForum. Please speciffy more briefly in which computer software or where did you found this term "bounce rate"..
In Google Analytics, bounce rate means rate of visitor leaving the site after first pageview versus visitor who navigate to other subpage/s
Wikipedia deffinition:
"A bounce occurs when a web site visitor only views a single page on a website, that is, the visitor leaves a site without visiting any other pages before a specified session-timeout occurs."