Onelook.com is described as 'Think of this web site as a search engine for words and phrases: If you have a word for which you'd like a definition or translation, we'll quickly shuttle you to the web-based dictionaries that define or translate that word' and is a Dictionary in the education & reference category. There are more than 10 alternatives to Onelook.com, not only websites but also apps for a variety of platforms, including Android, iPhone, iPad and Mac apps. The best Onelook.com alternative is Wiktionary, which is both free and Open Source. Other great sites and apps similar to Onelook.com are WordReference, Dictionary.com, Wordnote Dictionary and Google Dictionary.