Might be a pretty simple question, but I don't fully understand what the "stickiness" metric is all about.
I know that it is calculated by: single page visits/ entries, so does this mean it measures how many visitors stay on the page and don't venture to the rest of the site?
What you're describing pretty much defines bounce rate. Bounce rate is defined as the stickiness, or lack thereof, of a visitor. If a user visits one page then leaves, they are considered a bounce, meaning they didn't stick to your site.