The term "page rank" refers to a score that is assigned by Google's search engine algorithm to measure the importance and relevance of web pages. Full definition
Having links from these high traffic, high page rank websites to your website can add credibility to your site. (smallbusinessesdoitbetter.com)
Going through the following resources, if you get a Page Rank plugin / addon for your web browser you'll be able to see that they ALL have a pretty high page rank, which means it is still a very good indicator of how much Google likes them. (creativindie.com)
In the first part of this massive two - part episode, Bryan and guest co-host Nick Stephenson discussed tips related to masterminds, high page rank blogs, and his Nick's own mailing list tips for fiction. (sellmorebooksshow.com)