This terminological and notional dictionary of psychology tries to avoid the conception of an encyclopedic project that runs the risk, in a living discipline, of quickly becoming outdated. To this end, a group of recognized specialists in the different branches that make up psychology today have worked, without attempting to eliminate the particularisms of each one to found a fictitious unity of the discipline. As an annex to this dictionary, the translation of each of its entries is presented in five European languages, in order to help the circulation of scientific works within this new political-administrative complex.