Imagined Communities: Reflections on the Origin and Spread of Nationalism is a book by Benedict Anderson about the development of national feeling in different eras and throughout different geographies across the world. It introduced the term "imagined communities" as a descriptor of a social group—specifically nations—and the term has since entered standard usage in myriad political and social science fields. The book was first published in 1983 and was reissued with additional chapters in 1991 and a further revised version in 2006.