Building on the excellent definitions written by the crowd-sourced editors at Wiktionary, IDEA’s lexicographic team wrote more than 2,700 short, digestible definitions for all common words, including “who,” “what,” and “the.” For over 100k other words that also have Wikipedia entries, we included a snippet of the article as well.
To power the app, our team created the IDEA Linguabase, a database of word relationships built on an analysis of various published and open source dictionaries and thesauri, an artificial intelligence analysis of a large corpus of published content, and original lexicographic work. Our app offers relationships for over 300,000 terms and presents over 60 million interrelationships.
These include close relationships, such as synonyms, as well as broader associations and thousands of interesting lists, such as types of balls, types of insects, words for nausea, and kinds of needlework. Additionally, the app has extensive information on word families (e.g., “jump,” “jumping”) and common usage (“beautiful woman” vs. “handsome man”), revealing words that commonly appear before or after a word in real use.
Source: http://www.idea.org/blog//inotherwords/