A language or collection of dialects that descended from Old Saxon and is the ancestor of modern Low German, spoken from about 1100 to 1600.

The sign language used in Germany.

Unserdeutsch

a variety of or descending from Low Prussian (East Low German, Low German or Low Saxon), that developed in Royal Prussia and which is now spoken by communities not only in Germany but also in North America (Canada, the United States), South America (Argentina, Brazil), Russia and some other places. (Not to be confused with the High German language Pennsylvania German; both are spoken in Pennsylvania.)

(linguistics, dated) Proto-Indo-European

The modern stage of the Low German language, distinguished from its predecessor stages such as Middle Low German.

Old Low Franconian and Old Saxon

The form of the German language used for publishing, broadcasting and writing in Switzerland and Liechtenstein, as distinguished from the Swiss German language used in speech.

one of two major subgroups of the Central German dialects; spoken primarily in the German states of Hesse, Rhineland-Palatinate, Saarland, and North Rhine-Westphalia, as well as Luxembourg, easternmost Belgium, and southeasternmost Limburg (Netherlands); characterized by the preservation of pre-Old High German initial *p-.

of or pertaining to the West Central German dialects