Accessibility vs Availability

In this lesson, the stated benefits of Replication are:

to improve reliability, fault-tolerance, or accessibility

What does “accessibility” mean here? Is it the same as Availability? If it is different, how do these two concepts diverge?

Yes, accessibility here means availability. As if a server goes down then the data stored on it would have a copy on some other machine as well due to Replication hence making that data still accessible.