In this article we would like to illustrate how to combine the lexicographical description of an electronic learner's dictionary (DAFLES, Dictionnaire d'apprentissage du français langue étrangère ou seconde) and a corpus to build a learning environment for French vocabulary for learners of French as a foreign or second language at an intermediate or advanced level (ALFALEX). This is only possible if the lexicographical description is fully coherent, perfectly structured and enriched with information which is not always explicitly exhibited in traditional dictionaries, even in the electronic ones.
