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Eidgenossenschaft is a German word meaning confederation. The term literally translates as "oath fellowship". An Eidgenossenschaft is a confederacy of equal partners, which can be individuals or groups such as states, formed by a pact sealed by a solemn oath. Such an alliance could be either time-limited or unlimited (or "eternal"). An important characteristic is that the partners were always considered equal, in contrast to the oath of fealty in feudal societies with their strict hierarchies.

As a political term, it is used most often as a synonym for Switzerland, whose official German name is "Schweizerische Eidgenossenschaft" (the oath in question being the Rütlischwur).

In a historical context, Eidgenossenschaft typically refers to the medieval Swiss Confederacy, which grew from the 13th to the 16th century in central Europe, persisted until 1798 and then evolved into a federal state in the 19th century. When used in this sense, the eternal nature of the pact is necessary—the members of the Dreizehn Orte (Thirteen Cantons), as they called themselves, frequently made time-limited alliances sworn by oath with other partners, but such pacts were not considered an Eidgenossenschaft.

The members of an Eidgenossenschaft are called Eidgenossen (singular Eidgenosse). This term is documented in an alliance from 1351 between the Swiss cantons of Uri, Schwyz and Unterwalden and the cities of Lucerne and Zurich, which referred to themselves as such. In the evolution of the Swiss Confederacy, the members initially were not united by one single pact, but rather by a whole set of overlapping pacts and separate bilateral treaties between various members. The abstraction to the singular use of Eidgenossenschaft, which implies a stronger sense of community and the perception of a strong common cause, did not occur until some forty years later, after the Battle of Sempach, although it began already in the Pfaffenbrief of 1370, a treaty among some of the then eight members of the Swiss Confederacy.

Nevertheless, Eigenossenschaften existed already before. The communal movement in medieval Europe often led to similar alliances or leagues, called conjurationes in the Latin of the official documents of the time. The city alliances (Städtebünde) in the medieval Holy Roman Empire, in which the member cities also were equal, can be regarded as Eidgenossenschaften, too, although they generally proved less stable, partly due to their fragmented territories. The best known of these city alliances was the Hanseatic League, but many others existed in the 13th and 14th century. An early example is the Lombard League at the time of Frederick I "Barbarossa"; an example from Switzerland would be the "Burgundian Confederacy" of Berne.

In the Holy Roman Empire, emperor Charles IV outlawed any such conjurationes, confederationes, and conspirationes in his Golden Bull of 1356. Most Städtebünde were subsequently dissolved, sometimes forcibly, and where refounded, their political influence was much reduced. On the Swiss Eidgenossenschaft, however, the edict had no such effect as Charles IV, who was of the House of Luxembourg, regarded the Swiss as potential useful allies against his rivals, the Habsburgs.

• Eidgenossenschaft in German, French and Italian in the online Historical Dictionary of Switzerland.
• (German)Wikipedia: Städtebund