Wiktionary is generally a secondary source for its subject matter (definitions of words and phrases) whereas Wikipedia is a tertiary source for its subject matter (topics).

In essence, going from most reliable and thorough and narrow to most unreliable, shallow and broad; Wiktionary is a step in the middle of that route and a good choice if it's to be your one-stop resource, but not the best if you actually want to research given word. SF. SF.

Wiktionary was brought online on December 12, 2002, following a proposal by Daniel Alston and an idea by Larry Sanger, co-founder of Wikipedia. On March 28, 2004, the first non-English Wiktionaries were initiated in French and Polish. Wiktionaries in numerous other languages have since been started.

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.