Which digital dictionary product was the first major online reference work to introduce crowdsourced definitions and contemporary slang, launching in 1999?

In the world of language and linguistics, dictionaries have evolved dramatically with technology. One particular digital dictionary product launch revolutionized how we access language information, making it a landmark moment in linguistic technology. This poll tests your knowledge about this significant product milestone that changed how people interact with language resources worldwide.

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Urban Dictionary
Merriam-Webster Online
Oxford English Dictionary Digital Edition
Dictionary.com