So they for example speak of the Free World (note the capital letters) when they refer to a GNU/Linux distribution composed only of free software (Debian GNU/Linux used to be such distribution, and its "main" packages still constitute one), and they say that for example some free application that use non-free libraries can't be run in a Free World, since in a Free World these non-free libraries don't exist.
In a broader sense, lawyers for example are said to live in a Free World, because they have the freedom to study, modify and freely redistribute legal knowledge, decisions and strategies.
wikipedia.org dumped 2003-03-17 with terodump