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Macmillan Dictionary and Thesaurus: Free English Dictionary Online
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Smart learning with Red Words and Stars

Which English words are the most important to know? Watch this video to find out.

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Word of the Day

telescope

a piece of equipment shaped like a tube that you look through to make distant objects look closer...

Pronunciations

Set your default to American or British English in the options tab.

You can also switch between British English and American English by using the link at the end of each entry.

more about English pronunciation

Red Words and Stars

90% of the time, speakers of English use just 7,500 words in speech and writing.These words appear in red, and are graded with stars.

more about red words and stars

The future of dictionary is digital

Macmillan Dictionaries are no longer printing physical books. We still have some print versions in stock which can be bought from your local distributor or online until stock lasts.

Macmillan Dictionary Online is the go-to dictionary for English language learners.

Fun language games

Games are a great way to learn all sorts of things about English. Our interactive games are for English language learners as well as native speakers who are addicted to word games.

Play our online games.

Thesaurus

Every definition has an accompanying thesaurus entry.

The English language is growing, and so is Macmillan Dictionary

We're constantly adding new words to the site. Many of them are appearing in a dictionary for the first time.

Check out this week's new entries STEM and vape .

Real Examples

Clear and current example sentences mean that the English you read here is the English that is being used today.

example sentences

Usage Notes

Hundreds of usage notes provide helpful guidance on using language in context. Topics covered include Metaphor , Collocations , and How to avoid common errors .

how words are used
Macmillan Dictionary Blog

A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today.

global English and language change from our blog

conscious uncoupling

the act of ending a marriage or romantic relationship in a way which shows that the two people will remain friends …

Open Dictionary

Add your word to our record of English as it is used today: enriched by speakers around the world; driven by the speed of technology; powered by the globalization of language.

Gadgets

From a toolbar gadget to double-click functionality for your website, we've got a host of gadgets to choose from.

Social Media

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Celebrating 5 years of Macmillan Dictionary

Celebrating 5 years online

It's our 5th birthday this month! To mark this anniversary we have some special presents in store for you. Want to grab that chance of winning an iPad mini? Want to know more about our upcoming game? Read on to find out what we have in store for you this April.

Go to the Macmillan Dictionary's 5th Birthday page.

Join our treasure hunt

Treasure hunt 2014

Are you ready for the first Macmillan Dictionary Treasure Hunt? We are challenging you to find 25 hidden letters by answering questions about the Macmillan Dictionary world. Once you've found the letters, put your thinking cap on to find our secret sentence. One lucky explorer will win an iPad mini.

Start the treasure hunt today.

Language Resources

Using our expertise in the area of language learning, we create language resources that are both unique and entertaining. Recommended this month:

Read blog posts on the topic of American English on Macmillan Dictionary Blog.

Watch featured videos on our videos page.

Download our latest BuzzWord Lesson Plan , available to use in class for free!

Word of the Day

telescope

a piece of equipment shaped like a tube that you look through to make distant objects look closer...

Pronunciations

Audio recordings of all headwords are available in both British and American accents.

more about English pronunciation

Red Words and Stars

The most common 7,500 words of English are highlighted in red, and are graded with stars to show their frequency. These are the words that all learners need to know.

more about red words and stars

Clear Definitions

Definitions are written in plain English, using a vocabulary of just 2,500 words. This means that learners can be confident that they will understand all definitions first time.

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Learn a new life skill

Being a successful communicator is an important life skill. That's why through 2014 we are bringing you free lesson plans and language tips on pragmatics and expressing yourself.

Read more about our Life Skills campaign!

Thesaurus

Every definition has an accompanying thesaurus entry.

The English language is growing, and so is Macmillan Dictionary

We're constantly adding new words to the site. Many of them are appearing in a dictionary for the first time.

Check out this week's new entries STEM and vape .

Real Examples

Sometimes, an example can tell you as much as a definition. Macmillan Dictionary is packed with real examples which show you how the language is really used in the 21st century.

example sentences

Usage Notes

macmillandictionary.com gives you much more than a dictionary: hundreds of notes give guidance on difficult points of English usage, and help you to avoid those typical mistakes that are so easy to make.

how words are used

macmillandictionaryblog carries some of the best writing on the web about the English language, the way it's changing, and the way it's used across the globe.

What's your English? Do you learn it, live it or love it?

Every week, an in-depth article looks at a new or current word.

conscious uncoupling

the act of ending a marriage or romantic relationship in a way which shows that the two people will remain friends …

Open Dictionary

You don't have to work at Macmillan to write a dictionary entry. Our Open Dictionary welcomes contributions from lovers of English throughout the world.

Gadgets and API

From a toolbar gadget to double-click functionality for your website, we've got a host of gadgets to choose from.

  • get gadgets
  • read about API

    • Social Media

    We're all over social media – follow us!