It does give a definition: that there is none (lack of a definition is a definition). This is pretty clear if you read the whole page. Authoritarianism is just trying to distance itself from authority because all states wield authority in various ways, and so a word was created to separate the two and criticize the socialist bloc that also wielded authority, like the west did, but their authority was bad you see, not like ours which is good.

But why am I saying this; you didn't read the page, you're not gonna read this either.

In fact nobody has ever really been able to articulate to me why authoritarianism is bad beyond "I want my freedom". It just inherently is undesirable, don't ask too many questions, just accept it.