It is a slippery thing to define, as captured in the popular quote:
A problem that proponents of AI regularly face is this: When we know how a machine does something 'intelligent,' it ceases to be regarded as intelligent. If I beat the world's chess champion, I'd be regarded as highly bright
It is a slippery thing to define, as captured in the popular quote:
Generally this is called the AI Effect
I think Douglas Hofstadter puts it best: "AI is whatever hasn't been done yet."