| Noun | 1. | Preussen - a former kingdom in north-central Europe including present-day northern Germany and northern Poland; "in the 19th century Prussia led the economic and political unification of the German states"Deutschland, FRG, Germany, Federal Republic of Germany - a republic in central Europe; split into East Germany and West Germany after World War II and reunited in 1990 Brandenburg - the territory of an Elector (of the Holy Roman Empire) that expanded to become the kingdom of Prussia in 1701 Poland, Polska, Republic of Poland - a republic in central Europe; the invasion of Poland by Germany in 1939 started World War II Prussian - a German inhabitant of Prussia |