1. a headland, foreland, cape , (Homer), etc.

2. a mountain-top, summit : used by (Homer) only in the phrase κατ᾽ ἄκρης from top to bottom , i. e. utterly , πόλιν αἱρέειν κατ᾽ ἄκρης (Herdotus Historicus); so in attic, κατ᾽ ἄκρας utterly , [variant datesTragica Adespota, (Plato Philosophus)

3. the citadel of a city, Lat. arx, (Xenophon Historicus) (ML)