Collins English Dictionary is described as 'The official Collins English Dictionary online. Comprehensive and authoritative, rely on Collins for up-to-date English with insights into language trends and usage' and is an website in the Education & Reference category. There are more than 10 alternatives to Collins English Dictionary, not only websites but also apps for a variety of platforms, including iPhone, Android, iPad and Chrome OS. The best alternative is Wiktionary, which is both free and Open Source. Other great sites and apps similar to Collins English Dictionary are Dictionary.com (Free), Merriam-Webster (Free), Google Dictionary (Free) and The Free Dictionary (Freemium).
Google's dictionary extension on Google Chrome. With it, you can double-click any word to view its definition in a small pop-up bubble, or search the complete definition of any word or phrase using the address bar dictionary.
Online Dictionary - Multiple dictionaries including: English dictionary, medical dictionary, legal dictionary, financial dictionary, computer dictionary, thesaurus, dictionary of acronyms and abbreviations, dictionary of idioms, thesaurus, Columbia encyclopedia, Wikipedia...
Free online dictionary of British English and American English from Oxford. Translate from English to Spanish, French, Italian, and German with bilingual dictionaries. Get writing, spelling and grammar help, and play word games. (US)