Wiktionary (a portmanteau of the words wiki and dictionary) is a multilingual, Web-based project to create a free content dictionary, available in over 151 languages. Unlike standard dictionaries, it is written collaboratively by volunteers, dubbed "Wiktionarians", using wiki software, allowing articles to be changed by almost anyone with access to the website. Like its sister project Wikipedia, Wiktionary is run by the Wikimedia Foundation.

Because Wiktionary is not limited by print space considerations, most of Wiktionary's language editions provide definitions and translations of words from many languages, and some editions offer additional information typically found in thesauri and lexicons. Additionally, the English Wiktionary includes Wikisaurus, a category that serves as a thesaurus, including lists of slang words, and the Simple English Wiktionary, compiled using the Basic English subset of the English language. Wiktionary was brought online on December 12, 2002, following a proposal by Daniel Alston.

On March 29, 2004, the first non-English Wiktionaries were initiated in French and Polish. Wiktionaries in numerous other languages have since been started. Wiktionary was hosted on a temporary URL (wiktionary.wikipedia.org) until May 1, 2004, when it switched to the current full URL.

As of May 2009[ref], Wiktionary features well over 5 million entries across its 272 language editions. The largest of the language editions is the French Wiktionary, with over 1,450,000 entries. The English Wiktionary is the second largest and currently has over 1,300,000 entries.

It has traded the top position with the French Wiktionary on various occasions since the French Wiktionary first overtook the English Wiktionary in early 2006. Thirteen Wiktionary language editions now contain over 100,000 entries each. Despite Wiktionary's large number of entries, most of the entries and many of the definitions at the project's largest language editions were created by bots that found creative ways to generate entries or (rarely) automatically imported thousands of entries from previously published dictionaries.

Seven of the 18 bots registered at the English Wiktionary created 163,000 of the entries there. Only 259 entries remain (each containing many definitions) on Wiktionary from the original import by Websterbot from public domain sources; the majority of those imports have been split out to thousands of proper entries manually. Another one of these bots, "ThirdPersBot," was responsible for the addition of a number of third-person conjugations that would not receive their own entries in standard dictionaries; for instance, it defined "smoulders" as the "third-person singular simple present form of smoulder." Excluding these 163,000 entries, the English Wiktionary would have about 137,000 entries, including terms unique to languages other than English, making it smaller than most monolingual print dictionaries.

The Oxford English Dictionary, for instance, has 615,000 headwords, while Merriam-Webster's Third New International Dictionary of the English Language, Unabridged has 475,000 entries (with many additional embedded headwords). It should be noted, though, that more detailed statistics now exist to more clearly distinguish genuine entries from minor (small) entries.

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