Address space definition
The address space is the space (i.e., set) of addresses&nbsp;&ndash; see, e.g., Wikipedia. It's an abuse of terminology to claim that the address space is divided into pages. It isn't: it's the memory addressed by the addresses that's divided into pages.

(This confusion between addresses and the things referred to by addresses is common.  How many times have you heard people say, "I'll give you my email" when they mean "I'll give you my email address"?)