Wiktionary
A worldwide collaborative project to produce a free multilingual dictionary in every language, with definitions, etymologies, pronunciations and quotations. |
Wikipedia
A free-content encyclopedia, collaboratively written and edited by users worldwide. Browse by keyword, alphabetical index, or reference categories such as culture, geography, history, mathematics, science, society and technology. |
Wikibooks
A collection of open-content textbooks that anyone can edit. |
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