χρόνος  , chronos (time), 421, 423, 427, 432 n. 30 [BTJS  ]

Heidegger argues that the so-called “temporal  ” character of οὐσία   can be gathered from Plato  ’s designation of the “really real” (ὄν  τως ὄν) as ἀεὶ ὄν and ἀΐδος οὐσία (usually “eternal being”), although Heidegger argues that “the more sharply οὐσία is grasped and associated with the [Aristotelian] ‘categories,’ the more the relation to time gets shrouded.” In fact, Heidegger’s own notion of “time” differs radically from what he found in the Greeks. The classical philosophy of time (χρόνος) worked out in Aristotle  ’s Physics, for example, was of no use to Heidegger in his search for the source of being, because Book IV of that treatise focuses on time as a continuous series of “nows” and considers time as a thing that is. Thus the Physics is caught up in the classical question about the being of things rather than about being taken for itself. [SheehanMSH]