"Refer to" is not the same as "means the same as". The linked page is a disambiguation page, which is not the same as a page that is explaining exactly what a particular word means.
A conversion is a single thing: an event or transaction. A conversion rate is a number. The two are not identical.
Comments
I agree that I was not quite precise and I really don't have solid sources (not sure if there are standards/rules for this).
However, Wikipedia° suggests that conversion might refer to conversion rate. That's so far the only thing that I found from a few minutes search.
° http://en.wikipedia.org/wiki/Conversion#Marketing
"Refer to" is not the same as "means the same as". The linked page is a disambiguation page, which is not the same as a page that is explaining exactly what a particular word means.
A conversion is a single thing: an event or transaction. A conversion rate is a number. The two are not identical.