2. Proper noun. A linguistic marker for a number of West Germanic languages and dialects spoken in the former core of the Frankish Empire: the Low Countries (The Netherlands, Belgium and Luxembourg) and western Germany. Within these groups there are a number of well known languages and dialects, such as Dutch and Afrikaans but also the Pennsylvania German language spoken in North America. ¹
3. Adjective. Relating to the Franks or their empire, Frankish. ¹
¹ Source: wiktionary.com