ἐπικρατέω

1. to rule over , with dative, (Homer): absolute to have or hold power , (Odyssey by Homer)

2. to prevail in battle, be victorious, conquer , (Iliad by Homer)

3. with genitive to prevail over, get the mastery of an enemy, (Herdotus Historicus), attic:—;also to become master of , Lat. potiri, τῆς θαλάσσης, τῶν Ἑλλήνων (Herdotus Historicus), etc.

4. generally, to be superior , τῷ ναυτικῷ (Thucydides); κατὰ θάλασσαν (Xenophon Historicus) (ML)