> Nicely demonstrating that just as "open source" is open to multiple interpretations, so is "free software". Within certain communities, there are widely-accepted definitions (from OSI, FSF, Debian, etc) but not everyone automatically understands the terms according to these definitions.

At least for "free", it (used to be?) very common to add an "as in" after, like "free as in beer" (you don't have to pay) or "free as in speech" (you can do what you want with it).