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[TheNave]

vacuum fluctuations, dark energy, transiting gamma- and cosmic rays, neutrinos, along with other phenomena in quantum physics can still occur in vacuum as those things aren't made out of regular atoms and thus do not count as matter...

Not made of regular atoms? While quantum mechanics' stuff haven't been satisfying with all its wishy-washy ideas that has almost given fundamental particles "free-will", we can not just dismiss it, simply because it works. Using the Casimir effect, it was possible to actually pull a pair out of the vacuum. Regardless, the term matter, even though it can also be generally regarded as anything with mass, has been considered a loose term in Physics since the time Einstein had put forward a relation between mass and energy.

I might have chosen my words poorly, I only wanted to state the definition of a vacuum
as a space is always a vacuum as long as there are no "classic" elementary particles (electron, neutron, proton, etc)
no matter which other "stuff" there is flying around, it would still be called a vacuum by definition