Cambridge Dictionary		Longman Dictionary
Merriam-Webster (US)		Macmillan Dictionary
	Dictionary Thesaurus

 

 

Cambridge Dictionary

Guide to using the dictionary

 

Longman Dictionary

Guide to using the dictionary

 

Macmillan Dictionary

 

Oxford Dictionary

 

Merriam-Webster's Learner's Dictionary

 

Merriam-Webster

US dictionary with audio.

 

Wordsmyth.net

Dictionary and thesaurus, with a Beginner's version, Children's version and Advanced version.

 

Dictionary.com

Searches in several online dictionaries.

 

AskOxford.com

Compact Oxford English Dictionary online

 

What's the difference?

Native speaker dictionaries usually just give a definition of a word, whereas monolingual dictionaries for learners of English often provide useful information about how to use a word in speaking and writing.

 

For example, there may be information about what prepositions you need after the word, or about collocations (words that go together well).  Also, the definitions are in easier English, and you may be given example sentences too.