Utopia

Utopia (Nowhere), an imaginary island described by Sir Thomas More, and represented as possessing a perfect political organisation, and which has given name to all schemes which aim at the like impossible perfection, though often applied to such as are not so much impossible in themselves as impracticable for want of the due individual virtue and courage to realise them.

Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)