Wiktionary (English1 dataset
The English-language Wiktionary is a collaborative project to produce a free-content multilingual dictionary.
Designed as the lexical companion to Wikipedia, the encyclopaedia project, Wiktionary has grown beyond a standard dictionary and now includes a thesaurus, a rhyme guide, phrase books, language statistics and extensive appendices. We aim to include not only the definition of a word, but also enough information to really understand it. Thus etymologies, pronunciations, sample quotations, synonyms, antonyms and translations are included.
Offsite — “Welcome to the English-language Wiktionary, a collaborative project to produce a free, multilingual dictionary with definitions, etymologies, pronunciations, sample quotations, synonyms, antonyms and translations. Wiktionary is the lexical companion to the open-content encyclopedia Wikipedia.”