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The term acquis (or sometimes acquis communautaire), deriving from French, is used in European Union Law to refer to the total body of EU law accumulated so far. The term is also used to describe laws adopted under the Schengen treaty, prior to its integration into the European Union legal order by the Treaty of Amsterdam, in which case one speaks of the Schengen acquis.
The term has also been borrowed by the World Trade Organization Appellate Body, in the case Japan - Taxes on Alcoholic Beverages, to refer to the accumulation of GATT and WTO law ("acquis gattien"), though this usage is not well established.
It has also been used to describe the achievements of the Council of Europe (a body unconnected with the European Union):
(Section 12, Parliamentary Assembly of the Council of Europe Resolution 1290)
During the process of the enlargement of the European Union, the acquis is divided into 31 chapters for the purpose of negotiation between the EU and the candidate member states. These chapters are:
Such negotiations usually involve granting transitory periods before the need on the part of new member states to fully implement the laws of the European Union.