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Forget virtual particles for a moment as they don't really count. In space - real, deep intergalactic space (more remote even than Texas), there are only a few atoms per zillion cubic parsecs (OK, that's a slight exaggeration). What about in between those atoms? Surely, that is vacuum in the true sense of the word.
But is it vacuum?
We probably start getting too far into semantics here, but I would think the definition of a true vacuum is a place where there is a zero probability of encountering an atom