This issue of the Cahiers brings together the contributions of a study day organised at the UNIL on agglutinative languages. More than any other, this morphological category has been the subject of much discussion throughout the history of ideas and the history of linguistics. The study and description of agglutinative languages and their comparison with other languages have given rise to a whole series of reflections, and some linguists have idealized the agglutinative structure as being regular, transparent and unambiguous. The contributions in this collection are primarily devoted to discourses on agglutination, some of which also address agglutination from a linguistic point of view.