Is $x^0$ a polynomial?

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On the one hand I have seen this called a "constant polynomial" since $x^0 = 1$ for any $x$. But I would have thought this was a bad idea, because then any number can be considered the root of the polynomial $x^0 - 1$ and so every number is "algebraic" in this sense. So should $x^0$ be a polynomial or not?