Ok, if this is the level of technical precision that is required, then fine.
Technically speaking, we ALL have to interpret symbols, definitions, words. It is impossible not to. That's not what was meant. That I did not invent the category should be self-evident.
Now, I have to have a working definition of atheist. And it is possible (specially when someone wants to win an argument) to squabble about definitions for arguments sake. I don't expect you or anybody here to agree (for consensus sake) with my working definition, but I believe my definition is reasonable and would fit how most people who are knowledgable of the term.
If we can't agree on any definition, then, of course the discussion in moot.