In this paper I respond to the view that Heidegger is unable to account for the possibility of immediately experiencing others in their concrete particularity. Critics have argued that since Mitsein characterizes Dasein’s mode of being regardless of the presence or absence of others, Heidegger has essentially granted it the status of an a priori category. In doing so, they argue, Heidegger reduces the other to a mere interchangeable token whose uniqueness is subsumed under the generality of the established category. (...) In contrast, I argue that the Heideggerian ‘a priori’ must be understood as a living responsiveness to particularity, not a top-down imposition of abstract categoriality. The argument further shows that this responsiveness must be understood in terms of temporal particularity. The bulk of the paper then demonstrates the nature of such responsiveness when it is the temporal particularity of the other Dasein that is being encountered. I show that such encounters are a necessary condition for the possibility of world time and the worldly space of shared significance. Because my encounter with the other Dasein is a direct experience of her originary temporality—the fundamental expression of her concrete care-defined way of being—such encounters are not simple subsumptions of the other to an a priori category. They are, rather, a temporal responsiveness to the unique mode of intuitive givenness characterizing other Dasein. (shrink)