Germanisation, or Germanization, is the spread of the German language, people, and culture. It was a central idea of German conservative thought in the 19th and the 20th centuries, when conservatism and ethnic nationalism went hand in hand. In linguistics, Germanisation of non-German languages also occurs when they adopt many German words.
Under the policies of states such as the Teutonic Order, Austria, the Kingdom of Prussia, and the German Empire, non-German minorities were often discouraged or even prohibited from using their native language, and had their traditions and culture suppressed in the name of linguistic imperialism. In addition, the Government also encouraged immigration from the Germanosphere to further upset the linguistic balance, but with varying degrees of success. In Nazi Germany, linguistic Germanisation was replaced by a policy of genocide against certain ethnic groups, even when they were already German-speaking.
Historically there are different forms and degrees of the expansion of the German language and of elements of German culture. There are examples of complete assimilation into German culture, as happened with the pagan Slavs in the Diocese of Bamberg (Franconia) in the 11th century. An example of the eclectic adoption of German culture is the field of law in Imperial and present-day Japan, which is organised according to the model of the German Empire. Germanisation took place by cultural contact, by political decision of the adopting party, or by force.
In Slavic countries, the term Germanisation is often understood to mean the process of acculturation of Slavic- and Baltic-language speakers – after conquest by or cultural contact with Germans in the early Middle Ages; especially the areas of modern southern Austria and extant part of German East Elbia.