Abstract
The post-truth regime is a regime in which certain central categories of modernity seem to be inadequate: that of truth as correspondence, that of truth as verification, and that of truth as sincerity. This reflection aims at proposing a shift from the category of truth to the category of legitimacy, in order to rethink those of correctness, objectivity, adequacy. The advantage potentially offered by the concept of legitimacy, with regards to that of truth, has to do with the reference to a given context, with an element of social recognition and a processual dimension, which makes the management of discourses more flexible, without abdicating to their deregulation.