The author sets out with a hermeneutical purpose to analyse the precise meaning of the notion of «the author's intention» in Thomas Aquinas. He shows that from the semantic point of view the intentio auctoris pertains to the intentio voluntatis. Furthermore, the A. observes, on the one hand, that the intentio auctoris is a dynamic notion, as it intrinsically refers to a finality; and, on the other hand, that it has an analogical value, as it arises from the subjects of which Thomas predicates the intention. The article concludes with a hermeneutical placing in perspective of the question of the relationship between the intention of an author and the texts. Although considerably nuanced, the optimism of Thomas Aquinas concerning the understa...