The Basic Law for the Federal Republic of Germany (German: Grundgesetz für die Bundesrepublik Deutschland) is the constitution of the Federal Republic of Germany.
The West German Constitution was approved in Bonn on 8 May 1949 and came into effect on 23 May after having been approved by the occupying western Allies of World War II on 12 May. It was termed "Basic Law" (Grundgesetz, pronounced [ˈɡʁʊntɡəˌzɛts] ) to indicate that it was a provisional piece of legislation pending the reunification of Germany. However, when reunification took place in 1990, the Basic Law was retained as the definitive constitution of reunified Germany. Its original field of application (Geltungsbereich)—that is, the states that were initially included in the Federal Republic of Germany—consisted of the three Western Allies' zones of occupation, but at the insistence of the Western Allies, formally excluded West Berlin. In 1990, the Two Plus Four Agreement between the two parts of Germany and all four Allies stipulated the implementation of a number of amendments.