Eidgenossenschaft is a German word specific to the political history of Switzerland. It means "oath commonwealth" or "oath alliance", in reference to the "eternal pacts" formed between the Eight Cantons of the Old Swiss Confederacy of the late medieval period. In Swiss historiography, this relates most notably to the Rütlischwur between the three founding cantons Uri, Schwyz and Unterwalden, which traditionally dates to 1307. In modern usage, Eidgenossenschaft is the German term used as an equivalent to "Confederation" in the official name of Switzerland, Schweizerische Eidgenossenschaft. Its corresponding adjective, eidgenössisch—officially translated as "Swiss federal"—is used in the name of organisations such as the Eidgenössische Technische Hochschule, or Swiss Federal Institute of Technology. The term Eidgenosse refers to individual members of the Eidgenossenschaft. It is attested as early as 1315 in the Pact of Brunnen, referring to the cantons of Uri, Schwyz and Unterwalden. The abstract noun Eidgenossenschaft is attested in the 15th century. In modern usage, Eidgenosse is sometimes used in archaic or ironic usage for "Swiss citizen", especially for those citizens of purely Swiss origin and not from immigration.