What is the Social Cohesion? Some Remarks on the Semantics of a Sociological Basic Concept - In his paper, the author tries to analyse some innovative theories of social cohesion, pinpointing their respective and different semantics. This theories can be analysed as representative of sociological realism, holism and elisionism. From the realist point of view social cohesion can be conceptualized as one of the two layers of the social integration (as opposed to the system integration). In this sense the sociological theory has to improve its capacity to link the macro-, meso- and micro-sociological levels of analysis connecting it with the temporal morphogenesis of societies. From the holistic point of view, the social cohesion is the epiphenomenon of the society’s network structure. For the elisionist, social cohesion is reproduced by the situated interactions which suspend the cultural elements as well as the structural one. The author suggests that sociology should overcome the old lib-lab conceptualization of social cohesion conceived as the product of the good integration between the market and the state. Social cohesion should be redefined in a new relational way. Keywords: social cohesion; relational society; realism; holism; social integration.