Of or relating to the Netherlands or its people or culture. Of or relating to the Dutch language. Archaic German. Of or relating to any of the Germanic peoples or languages. Of or relating to the Pennsylvania Dutch. (used with a pl. verb) The people of the Netherlands. Archaic A Germanic people. The Pennsylvania Dutch. The official West Germanic language of the Netherlands and one of the official languages of Belgium. Archaic One or more of the West Germanic languages of Germany, Switzerland, and the Low Countries. See Pennsylvania Dutch. Slang Anger or temper.