Definitions for "Page impression"
A page impression is recorded when the whole Web page is delivered to a Web browser. Current standards gauge traffic by page impressions on a per monthly basis.
a more reliable measure denoting one person viewing one page
A Page impression occurs every time a particular web page is viewed by someone using the Internet.
Keywords:  request, robotic, sent, campaign, user
a combination of one of more files sent to a user via that user's request
a file or a combination of files sent to a USER as a result of that USER's request being received by the server
User’s action to call a page. It should be differentiated from a 'request', which is a request to a search engine or a directory.
Keywords:  downloading, single
the downloading of a single page.