Abstract : We shall now compare the definitions of « communication » found in various dictionaries. Communication is a process integral to each moment of a relationship. It assumes actors, intentions and shared meaning. It is now officially recognized as an academic science. There is also a consensus about the fields it covers. But questions remain. Is it possible to describe a “communication” without interlocutor? Is it sufficient to call it a “detector of difference”? This kind of expression reveals perhaps the same tension that we observe in the term “anthropology” : it is an epistemological choice. The preference of an approach which does not account for individual interiority.