Source : Webster's Revised Unabridged Dictionary (1913)

Utopia \U*to"pi*a\, n. [NL., fr. Gr. not + ? a place.]
   1. An imaginary island, represented by Sir Thomas More, in a
      work called Utopia, as enjoying the greatest perfection in
      politics, laws, and the like. See {Utopia}, in the
      Dictionary of Noted Names in Fiction.

   2. Hence, any place or state of ideal perfection.

Source : WordNet®

Utopia
     n 1: a book by Sir Thomas More (1516) describing the perfect
          society on an imaginary island
     2: ideally perfect state; especially in its social and
        political and moral aspects [ant: {dystopia}]
     3: a work of fiction describing a utopia
     4: an imaginary place considered to be perfect or ideal [syn: {Zion},
         {Sion}]