town in Germany, first recorded 993 as Poztupimi; the name is Slavic, the first element is po "by near," the second element evidently was influenced by Dutch names in -dam. The Potsdam Conference of the victorious Allies in World War II was held July 17-Aug. 2, 1945, to decide the fate of Germany. During the Cold War, the town was in the Soviet sector and the bridge there across the Havel was one of the restricted border crossings between East Germany and West Berlin. The Americans and the Soviets used it for the exchange of captured spies. 

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Definitions of Potsdam

Potsdam (n.)
a city in northeastern Germany; site of the Potsdam Conference in the summer of 1945;