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See also: Heideggerian terminology

Dasein is a concept forged by Martin Heidegger in his magnum opus Being and Time . It is derived from da-sein, which literally means being-there/here, though Heidegger was adamant that this was an inappropriate translation of Dasein. In German, Dasein is synonymous with existence, as in I am pleased with my existence (ich bin mit meinem Dasein zufrieden). For Heidegger, however, it must not be mistaken for a subject, that is something objectively present. Heidegger was adamant about this distinction, which carried on Nietzsche's critique of the subject. Dasein, as a being that is constituted by its temporality, illuminates and interprets the meaning of being in time. For more information, see other related Heideggerian concepts, such as being-in-the-world.

Heidegger used the concept of Dasein to uncover the primal nature of "Being" (Sein) which Descartes and Kant left unexplored. Like Nietzsche, Heidegger criticized the notion of substance, arguing that Dasein is always a being engaged in the world. The fundamental mode of being is not that of a subject or of the objective but of the coherence of being-in-the-world.

On Heidegger's account, traditional language, logical systems, and beliefs obscure Dasein's nature from itself. Beings are Dasein even when they are ontologically wrapped up in a tradition which obscures the authentic choice to live within and transmit this tradition. In this case Dasein still authentically chooses the tradition when it is confronted by a paradox within the tradition and must choose to dismiss the tradition or dismiss the experience of being confronted with choice.

Heidegger attempted to maintain the definition of Dasein as we all are, in our average everydayness. Dasein does not spring into existence upon philosophical exploration of itself. Heidegger intended Dasein as a concept, in order to provide a stepping stone in the questioning of what it means to be. When Dasein contemplates this, what seems (absurdly) circular in ontic terms, is recursive in ontological sense, because it brings the necessary appearance of time to the center of attention.

In Being and Time, Heidegger opens by positing that the potentialities of Dasein's being extend beyond the realms disclosed by positive science or in the history of metaphysics. "Scientific research is not the only manner of Being which this entity can have, nor is it the one which lies closest. Moreover, Dasein itself has a special distinctiveness as compared with other entities [...]" What distinguishes Dasein from other existent entities is that "[...] in its very Being, that Being is an issue for it." Dasein's very nature poses a philosophical (or ontological) problem for it. Thus, we see Heidegger, being Dasein, attempt to tackle this innate dilemma in his philosophical works.

For Karl Jaspers, the term "Dasein" meant existence in its most minimal sense, the realm of objectivity and science, in opposition to what Jaspers called "Existenz", the realm of authentic being. Due to the drastically different use of the term "Dasein" between the two philosophers, often confusion occurs in students who have studied either Heidegger or Jaspers first and then moved on to the next philosopher.

In Philosophy (3 vols, 1932), Jaspers gave his view of the history of philosophy and introduced his major themes. Beginning with modern science and empiricism, Jaspers points out that as we question reality, we confront borders that an empirical (or scientific) method can simply not transcend. At this point, the individual faces a choice: sink into despair and resignation, or take a leap of faith toward what Jaspers calls Transcendence. In making this leap, individuals confront their own limitless freedom, which Jaspers calls Existenz, and can finally experience authentic existence.

But if Existenz is a subjective state of being, how can it be evaluated and analyzed by the individual? Jaspers suggests social interactions offer guidelines that individuals either adopt or reject. In other words, Existenz is a solitary state derived from the values of society. As with Sartre’s idea of “mirrors” (“Hell is other people!”), Jaspers writes of the self as “reflection in someone else’s authentic self.” Unless we know what others think and expect of us, we cannot decide who we are or want to be.

Jaspers, therefore, presents a view in which all people depend upon society for self-definition, even if the act of definition is a rejection of society’s values. No one is truly apart from society. In the extreme, a hermit defines his or her self as a complete rejection of social structures, but here is no “hermit” without a society from which to seek shelter. As a result, individuals experience a constant sensation of conflict: a desire to define the self freely while requiring society for that definition. source

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