Abstract
This paper presents the Papillon project dedicated to the building of a linguistically rich multilingual lexical database. This project is based on collaborative construction principle , which allows each one, professional or amateur, institution or individual, to contribute, with its own means, to this building task. For such a collaboratif work to be effective, it is necessary to provide a important set of multilingual lexical information, that will be the base of the contributors' work. After a presentation of the linguistic, lexical and software architectures of the Papillon project, we detail the method used to create the initial lexical information