1.an inroad, invasion, attack, Hdt., Eur.
2.an entrance, pass, ἡ ἐσβ. ἡ Ὀλυμπική the pass of Mount Olympus, Hdt.: a strait, Eur.:—so in pl., of Thermopylae, Hdt.:—in pl. also, the mouth of a river, id=Hdt.
3.an entering into a thing, a beginning, Eur., Ar.