Hun /hʌn/ BrE AmE noun
1 . the Huns [P] a group of ↑ nomadic people from Mongolia who entered Europe in the 4th century AD and gradually took control over a large part of central and eastern Europe. Their most famous leader was Atilla, and they are thought of as being cruel and enjoying war and fighting.
2 . [countable] a member of this people
3 . the Hun [P] slang an insulting word for German people, used especially during World War I