International audienceOne of the consequences of the events that occurred in France in January and November 2015, and of the Syrian war is the focus on radicalisation phenomena. Nonetheless these phenomena have long history as this 1965' title shows: " Notre république: Ben Bella préparait une radicalisation de son régime " (Le Monde, June 1965). In order to describe the current meanings of the indeterminate concept of radicalisation, we proceed to a systematic study of 4 daily newspapers between 1995-2015, using the logiciel Mallet. We distinguish several relevant semantic fields regarding the notion of radicalisation and their temporal variations. We show a restriction of these semantic fields since 2012, leading to a quasi identification...