ABSTRACT This article seeks to conceptually clarify the measurement of Europeanization from a transactional perspective. Following Karl Deutsch, we regard cross-border practices and sense of community as constitutive for an emerging European society. But we critically reassess how this approach has been put into empirical practice by contemporary scholars. Typically, too much attention is paid to absolute Europeanization, and too little to relative Europeanization. In order to properly investigate the European society as situated between the nation-state and the world society, we argue that Europeanization involves both national openness (the salience of Europe compared to the nation-state) and external closure (the salience of Europe compared to the world). Three indices are suggested to capture relative Europeanization and its major components. Recent Eurobarometer and European Values Study data on practices and attitudes of EU citizens is used to illustrate our approach empirically. The results demonstrate that external closure adds a new layer of information for understanding everyday life Europeanization. We also find a bifurcation between practices for which Europe is the more relevant reference frame (as compared to the world) and attitudes for which it is not.