Cost / License
- Free
- Proprietary
Platforms
- Online
Macmillian Dictionary and Thesaurus is described as 'The Free Online English Dictionary from Macmillan Publishers' and is a Dictionary in the education & reference category. There are more than 10 alternatives to Macmillian Dictionary and Thesaurus, not only websites but also apps for a variety of platforms, including iPhone, Android, iPad and Android Tablet apps. The best Macmillian Dictionary and Thesaurus alternative is Dictionary.com, which is free. Other great sites and apps similar to Macmillian Dictionary and Thesaurus are Power Thesaurus, Merriam-Webster, Google Dictionary and Apple Dictionary.
Learn thousands of real slang words or add your own. Slang thesaurus, maps, usage voting, offensiveness rating, more.

The official Collins English Dictionary online. Comprehensive and authoritative, rely on Collins for up-to-date English with insights into language trends and usage.
The Longman Dictionary of Contemporary English Online is an online version of the CD-ROM of the Longman Dictionary of Contemporary English, Updated Edition.
Advanced English Dictionary is better than other dictionaries, not just because it contains far more words than a conventional paper dictionary, but because it uses a radically new approach to searching for words.



Advanced English Dictionary is the most popular commercial alternative to Macmillian Dictionary and Thesaurus.
The single-volume international English dictionary with the widest coverage of all the riches of the English language. Clear, accurate and occasionally witty definitions, with the latest new words from science, technology and contemporary culture.




LookUp is an easy to use English dictionary app with beautiful Word of the Day illustrations and an award winning design to lookup all you want to know about about a word in a single search. It’s a great reading companion for avid readers, and a visual learning tool for kids...







The largest and most trusted free online dictionary for learners of British and American English with definitions, pictures, example sentences, synonym.


