Solecopedia is an encyclopaedia project aimed at supporting responsible, plural and solidarity economy. It is free, participatory and multilingual. Its objective is to help the actors in this field to work together to jointly develop a shared referential that will help overcome the difficulties of communication between countries, languages and sectors. These actors have expressed their interest in achieving a global mapping of the initiatives that correspond to their values. But this general effort of organising and sharing information is confronted by the obstacle of linguistic diversity, as well as the differences in concepts and vocabulary. By proposing both a process and collaborative, shared tools, Solecopedia allows all actors to enter and make comments on the key ideas that their practice involves, all in their own language. The links between languages and comments on entries will allow people to reach a deeper understanding of subtleties, as well as strengthening the shared ground.