<human>:  When did the Nazis start to use the term ‘Aryan’?
<bot>: The Nazis started to use the term “Aryan” in the 1930s. The term “Aryan” originally meant someone who spoke a language belonging to the Indo-European language family. It was first used in the 19th century to describe the people of India. In the 20th century, the Nazis adopted the term “Aryan” to describe the people of Europe. The Nazis believed that they were the purest of all races and that the other races were inferior.