High German

1. German as indigenously spoken and written in Austria, Switzerland, and central and southern Germany.
2. The standard variety of German used as the official language in Germany and Austria and as one of the official languages in Switzerland.

[Translation of German Hochdeutsch : hoch, high (from the mountainous terrain of the area in which it originated) + Deutsch, German.]

The noun has one meaning:

Meaning #1: the standard German language; developed historically from West Germanic
  Synonyms: German, German language