Apodictic defined

Reading Eco, I learned the word apodictic. Here is Wikipedia's defintion:

"Apodictic" or "apodeictic" (Ancient Greek: "αποδεικτικος," "capable of demonstration") is an adjectival expression from Aristotelean logic that refers to propositions that are demonstrable, that are necessarily or self-evidently the case or that, conversely, are impossible.[1] Apodicticity is the corresponding abstract noun, referring to logical certainty.