Sentence:  The concern of <WSD>Utopia</WSD> is with the optimo reipublicae statu , the best ordering of a civil society ; and it is again and again made clear that Utopian communism provides the institutional array indispensable to that best ordering . 
Meaning of the word marked with <WSD> tags:  a book written by Sir Thomas More (1516) describing the perfect society on an imaginary island