title: API or XML: Get sentence by word service
body: <p>I'm trying to find a free service that can give a sentence by word.
  That could be an explanation of the word or any other sentence with this word.
  Is there any free service without registration?
  I thought <a href="http://thefreedictionary.com" rel="noreferrer">thefreedictionary.com</a> has something like that but I didn't find such kind of service on their web-site.</p>