1.a headland, foreland, cape, Hom., etc.
2.a mountain-top, summit: used by Hom. only in the phrase κατ᾽ ἄκρης from top to bottom, i. e. utterly, πόλιν αἱρέειν κατ᾽ ἄκρης Hdt.; so in attic, κατ᾽ ἄκρας utterly, Trag., Plat.
3.the citadel of a city, Lat. arx, Xen.