What is Benelux?

Legal Definition
The Benelux Union (Dutch: Benelux Unie; French: Union Benelux) is a politico-economic union of three neighbouring states in western Europe: Belgium, the Netherlands, and Luxembourg.

The name Benelux is formed from joining the first two or three letters of each country's name – Belgium Netherlands Luxembourg – and was first used to name the customs agreement that initiated the union (signed in 1944). It is now used more generally to refer to the geographic, economic and cultural grouping of the three countries.

In 1951, these countries joined West Germany, France, and Italy to form the European Coal and Steel Community, a predecessor of the European Economic Community (EEC) and today's European Union (EU).

The main institutions of the Union are the Committee of Ministers, the Benelux Parliament, the Council of the Union and the Secretariat-General, while the Benelux Organization for Intellectual Property and the Benelux Court of Justice cover the same territory but are not part of the Union.

The Benelux General Secretariat is located in Brussels. It is the central administrative pillar of the Benelux Union. It handles the secretariat of the Committee of Ministers, the Council of Economic Union and the various committees and working parties.
-- Wikipedia
Legal Definition
A union between Belgium, Netherlands, and Luxembourg. It was stared in 1948 to decrease imports and let labor and capital move between the countries. Its now a part of the European Union.