http://lcl.uniroma1.it/babelnet/

  Good. This one will help me out a lot. I'll still need my Excel
  methods and my copy/paste thievery for my research from
  Thesaurus but this will help me doublecheck my work based on the
  combined knowledge of millions of people over thousands of years
  who came up with these words and meanings, and the work of
  hundreds of modern researchers who compiled this data,
  programmers who codified it and put it together. When it's all
  done everything will be very simple and obvious. It's just that
  - getting to that point takes a lot of work :)

  This is just a small step in a big process but it's working.