Abstract : If we analyse the semantic field of the term “anthropology” we find that the idea covers a very wide range. At the same time however, expressed opinion follows three basic ways. First of all through definitions or lists of characteristics. Or else through the choice of methods used to analyse the human fact. Finally there are the moments where a researcher admits that he can define only the contours of a concept whose core he still ignores. We can say that there exists an “anthropology” in an ethnographic sense or a “biological anthropology”. But every thought also has an “anthropological instant”, that is an explicit or implicit representation of humanity which stands out from interpretations and epistemological passages.