There is a tendency to assume otherwise, to take authenticity for a real predicate, and this is true not only of proponents of existentialism. We find even prominent interpreters of Heidegger using "authenticity" as a real predicate, as a quality applied to a referent present at hand. Let a couple instances suffice.
For John M. Anderson philosophy, as the love of wisdom, is a concern for what is ultimate. The essays in this volume take to heart this understanding of philosophy, and are therefore responses to the ultimate. The first four essays by Kaelin, Schrag, Baillif and Johnstone, deal with Anderson's own account of ultimacy as it is presented in his reflections on the aesthetic occasion, the experience of the sublime, on freedom and on insight. The concern for what is ultimate is formulated differently by each of the other eight essays. Desmond articulates ways of our encounter with the ultimate by means of what he calls essential perplexity. Gendlin reflects on Aristotle's characterization of thinking as an activity that is ultimate. Biemel and Lingis present death as an aspect of the ultimate. Hersch sees our loss of meaning and value as the result of our refusal of finitude and thus of our denial of the ultimate which reveals itself in this finitude. Ginsberg initiates us into the ultimacy of the human encounter that is dialogue. Verene speaks of the ultimate through his account of the fool. For Kockelmans philosophy, unlike science, deals with what-is as it manifests itself in our encounter with our lived world which is a source of meaning, and in that sense an ultimate. Finally, John M. Anderson writes of the awareness of our becoming more than we are, and does so by bespeaking the origin of the dialogue we are.