If you can't define intelligence in a way that distinguishes AIs from people (and doesn't just bake that conclusion baldly into the definition), consider whether your insistence that only one is REAL is a conclusion from reasoning or something else.

About a third of Zen and the Art of Motorcycle Maintenance is about exactly this disagreement except about the ability to come to a definition of a specific usage of the word "quality".

Let's put it this way: language written or spoken, art, music, whatever... a primary purpose these things is a sort of serialization protocol to communicate thought states between minds. When I say I struggle to come to a definition I mean I think these tools are inadequate to do it.

I have two assertions:

1) A definition in English isn't possible

2) Concepts can exist even when a particular language cannot express them