Abstract
In this article, I aim to interpret the concept of Eudaimonia ("living well" and "acting well") in Aristotle through the analytical method, with the goal of proposing a solution to the doctrinal conflict regarding whether this concept is dominant or inclusive in relation to other ultimate human ends. The proposal is to understand it as a proper name and a rigid designator, detailing its properties in Books I and X of Ethica Nicomachea. First, the main inclusive and dominant doctrines are examined in detail. Finally, the conclusion is reached that the proper name Eudaimonia does not possess the same properties in these books and, therefore, does not have the same referent.