his paper focuses on Gadamer''s concept of understanding. In Wahrheit und Methode(1960), he defines understanding as a "fusion of horizons". This is a key concept, which clearly demarcates his philosophical position against other positions, including the older hermeneutic tradition from Schleiermacher to Dilthey on one hand and against reductive scientism on the other. In the first and the second part, the paper seeks to analyze in detail the concept of understanding in Wahrheit und Methode. The main argument of this paper, however, is that there occurs a discrete change in Gadamer''s conceptualization of understanding after the publication of Wahrheit und Methode. This change occurs specifically in response to Celan''s poetry in the book Wer bin Ich und Wer bist Du?(1973/1986). This is the main topic in the third section of this paper, which builds on the previous analysis of understanding in Wahrheit und Methode in order to analyze Gadamer''s later revision. The revised notion of understanding, this paper suggests, marks a shift from a conjunctive to a disjunctive form of understanding.