This essay examines the concept of meaning in Sein und Zeit. By identifying a paradox in the question constituting the outset of Heidegger’s ontology, i.e. the question of the meaning of Being, the need of a clarification of the concept of meaning unfolds. According to Heidegger, namely, we have been asking the question of Being without even knowing what we mean; we have forgotten to ask the question of the meaning of Being. At the same time, since the actual question of Being necessarily is a question of the meaning of Being, i.e. since we, as human beings and as the sole origin of the question of Being, necessarily mean something with the questions we ask, we have been asking exactly the question we have forgotten to ask. What then, I ask, is this element, that we have been asking for but forgotten to address? What is meaning? Asking this question on the basis of Sein und Zeit, I argue, is necessarily to explore the Being of meaning, since meaning is something found in the constitution of Dasein, the human being, and since the explication of Dasein evolving in Sein und Zeit concerns exactly its Being. After clarifying this question, the study proceeds in three chapters, the first concerning the basic structure of Dasein, the second the understanding, as the knowing of this structure, and the third the explication, in which we finally find the constitutive elements of meaning, i.e. it’s Being. In dialogue with secondary sources, I then aim to discuss the implication of this Being, epistemic as well as political and ethical. Subsequently, I ask what this Being implies for the paradox initially noted.