This study emphasizes the importance of a univocal concept of the third sector. It first justifies the conceptual importance of univocality from a epistemological perspective and for the study of social facts (as an object of knowledge). Secondly, it argues the need for univocality since the concept is relevant to various public policies, and because it influences the integration of agents who contribute to social change. Finally, it looks at the divisions that can both confine social space and characterize the particularities of the entities that operate within it.
third sector; altruism; solidarity economics; social economy; non-profit entities; social action