It has to not be a currency to be a virtual currency, by the definition you favor.
Any answer I can imagine that you would give would invalidate other things we all consider currencies, unless you draw a line based on non-fundamental properties (e.g. such as backing by government force or market cap). And you can't form a proper concept using non-fundamental properties.
So the definition you favor actually supports my view, though I think the definition you favor lacks appropriate context and nuance (which is often true of dictionary definitions).
Talking about the government defining something creating meaning is just irrelevant. You're obviously telling me things I already know, but the government is technically incorrect on this. Just as they are on calling capital gains "unearned income," for example, since many successful investors work hard and do earn their income.