Abstract
Subsidiarity is a key term in the development of the European Union. The word itself was unknown in the English language until recently when it was first used and immediately became a key concept in the European political discussion. Since then, everyone is using it according to their own interpretation and purpose. From the extreme left to the extreme right, from the Euro-sceptics to the Euro-enthusiasts, the term is used to justify contradictory points of view.Is it because its meaning is so vague that anyone can use it at will? Is it because this concept, which seems at first hand to be so clear, does not mean anything and is useless in rethinking the renewal of social organization? The European purpose in introducing the subsidiarity principle was to give a place to intermediary communities, but the whole ambiguity of the concept is related to the comprehension of what is called a community. This in its turn is related to the view one has of what a human being is, and of the importance of his relationship with others for the constitution of his identity.If a community is part of the human identity, this has a deep influence on the understanding of what a community is, and the consequences of the principle of subsidiarity point towards much more than a mere principle of political federalism