Utopia is a name for an ideal community or society, taken from the title of a book written in 1516 by Sir Thomas More describing a fictional island in the Atlantic Ocean, possessing a seemingly perfect socio-politico-legal system. The term has been used to describe both intentional communities that attempted to create an ideal society, and fictional societies portrayed in literature. "Utopia" is sometimes used pejoratively, in reference to an unrealistic ideal that is impossible to achieve, and has spawned other concepts, most prominently dystopia.
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