Final answer:
The German term that refers to a synthesis of many of the arts into one unified work, or "total work of art," according to Wagner, is Gesamtkunstwerk.
Step-by-step explanation:
The German term that refers to a synthesis of many of the arts into one unified work, or "total work of art," according to Wagner, is Gesamtkunstwerk. It is a concept that emphasizes the integration of different art forms, such as music, visual arts, and theater, into a cohesive artistic experience. Wagner believed that the combination of these arts would create a more immersive and powerful artistic expression. An example of Gesamtkunstwerk is Wagner's own opera cycle, The Ring of the Nibelung, where he aimed to blend music, poetry, and stage design seamlessly.