Quote Originally Posted by RathSkybreaker View Post
Massive means extremely large, which could refer to the zone, not directly stating the amount of players in a said instance.
In MMORPG, the MM is actually one concept as a whole. Massive Multiplayer.

Doesn't mean the world is massive, because that can apply to single-player games.

Massive multiplayer most likely refers to the hundreds or thousands of players that are playing on the same server in the same world.

In Diablo's case, the only concept where that game is Massive Multiplayer is the hub, or lobby.