Noun
private international law (uncountable)
The law of a state that decides the law of which state is applied to legal relationships in civil and commercial matters that contain foreign elements.
In some cases, domestic courts may render judgment against a foreign state (the realm of private international law) for an injury, though this is a complicated area of law where international law intersects with domestic law. Source: Internet
This was unlikely to be a problem, since it is a generally accepted principle of private international law that states determine their currencies, and that therefore states would accept the European Union legislation to that effect. Source: Internet