δούο

From LSJ

μέγα γὰρ τὸ τῆς θαλάσσης κράτοςgreat is the power of the country that controls the sea, control of the sea is a great thing, the dominion of the sea is a great matter, the rule of the sea is a great matter, the rule of the sea is indeed a great matter, control of the sea is a paramount advantage

Source

Spanish (DGE)

v. δύο.