The paper presents the Delphi method and tests its usefulness when searching for a consensus on definitions, especially in a particular social science field. Based on an overview of the characteristics and uses of the Delphi method, a special Delphi design for searching for minimal common definitions of globalisation, Europeanisation and internationalisation in higher education and their mutual relationships is presented in detail. While the method proved valuable, its strengths and weaknesses are also discussed. Finally, ideas for adjusting the Delphi method are proposed.