Also Wiktionary imported the whole Webster dictionary from early 20th century sometime in the beginning of their operation, and apparently Webster was a fan of thoroughly describing each of the twenty meanings of a word. Which tradition continues in Wiktionary to this day — instead of giving three-word descriptions for two or three meanings tops, as other online dictionaries do.

My one complaint is that the thesaurus at Wiktionary is so-so, being exhaustive only for things like euphemisms, which naturally have many synonyms. In most cases, Thesaurus.com is a better resource.