Free Trial Version
To try Lexicontext download the trial version here.
You can also download a sample XCode project of a trivial Lexicontext-based app here.
The trial version is fully functional, but has one (important) limitation: you can only look-up word definitions for words that begin with the letter 'A' :)
If you find Lexicontext useful, you can buy the full version for $20 by clicking the Buy button on the right.