What is meant by "page-level"?

My primary interest is understanding it in the context of information architecture, e.g.:

... you should group and structure information at the page level and enforce rigorous user testing.

In an information architecture, isn't every level essentially made up of pages? What does this mean?

But of course, "page level" is also used beyond IA. From previous Stack Exchange questions and answers: page-level design changes, page-level interactions, page-level blocks and elements and tasks and prototypes. Can someone shed a little light on this? Page-level as opposed to ... what other levels?