[throwaway1410]

I think it's purely intuitive concept, with no clear definition. But without it, literally every particle in this universe is making an impact.

[dylanjermiah]

In other words, it's a hazy and easily misinterpret-able term. No, defining a prerequisite/s instead of relying on an general idea of 'intuitiveness' would be a more appropriate approach.

Everything 'makes an impact' the magnitude of the impact makes all the difference.