Display definition of the term searched for - above search results
It turned out it was necessary to use Wordnik api (or similar) to get the definition service that I required. So I've written a module to handle the api and show definition/image for the searched terms if available.

After talking to Google support and verifying my research that google no longer provides a definition service (they did back in 2011) to private websites, I realized it best to abandon the idea of using the google custom search engine. Instead I've setup Solr which is a bit more work but much more custom.