With plural agreement. A confederation of Germanic peoples originally occupying southwest Germany between the Rhine, the Main, and the Danube, and later parts of Switzerland and Alsace.
The Alemanni are first mentioned in the 3rd century a.d. in Greek sources. At the end of the 5th century they were conquered by the Franks and their territory annexed to the Merovingian (and later Carolingian) kingdom.
Old English; earliest use found in Orosius' History. From post-classical Latin Alemanni, plural noun (4th or 5th century in Jerome; from 9th century in British sources; also Alamanni; compare Hellenistic Greek Ἀλαμανοί, plural noun (3rd century a.d.)) from an unattested Germanic compound from the Germanic base of all + the Germanic base of man.