German, in the German language.
"She decided to learn deutsch because she was planning a trip to Germany next summer."
In plain English: Deutsch means something that is from Germany, German-speaking, or related to the German language and culture.
"She speaks German very well because her family is from Germany."
German. (the language)
"She asked me to translate the document into deutsch so she could read it in her native language."
The English word deutsch comes from the German term Deutsch, which literally means "German." It shares a common ancestor with the related words Dutch and Doitsu found in other languages.