Wiktionary has a very inclusive list of definitions. It does include hackathon: http://en.wiktionary.org/wiki/hackathon http://en.wiktionary.org/wiki/hackathon

Wiktionary has a very inclusive list of definitions. It does include hackathon: http://en.wiktionary.org/wiki/hackathon http://en.wiktionary.org/wiki/hackathon For such a tool to be most useful, I'd recommend gathering data from several places (such as DuckDuckGo, Wiktionary, Wikipedia). Also, it would be better not to be tied to fixed thresholds (such as 10 million results); rather, it would likely be better to construct a feature vector and try out various machine learning approaches.