Does this definition of a primitive polynomial make sense?

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I have this question in a past exam paper.

Let $F_p$ be the field of integers modulo prime $p$.

I have the question

What is meant by saying $f$ is primitive?

This is the solution I have.

If deg$f=h$ and $f(\alpha)=0$ for $\alpha \in F_p h$ then $f$ is primitive if the order of $\alpha$ is $p^h -1$.

What is $p^h$?