Merriam-Webster Learner's Dictionary

The Merriam-Webster Learner's Dictionary (learnersdictionary.com) is a monolingual dictionary for intermediate to advanced learners of English.

• Headwords are defined using simple language for learners. (3000 "Core Vocabulary" words are identified here.)
• You can listen to recorded pronunciations of headwords.

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Collins Cobuild English for Learners Dictionary

The Collins Cobuild English for Learners Dictionary (at www.collinsdictionary.com) is a monolingual dictionary for intermediate to advanced learners of English.

• Headwords are all defined using a 3000-word defining vocabulary.
• You can listen to recorded pronunciations of headwords.
• You can see translations of the headword or look it up in several bilingual dictionaries.

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Oxford Advanced Learner's Dictionary

The Oxford Advanced Learner's Dictionary (www.oxfordlearnersdictionaries.com) is a monolingual dictionary for intermediate to advanced learners of English.

• Headwords are all defined using a 3000-word defining vocabulary. (You can see the "Oxford 3000" defining vocabulary listed here.)
• You can hear British (BrE) and American (NAmE) pronunciations of headwords.
• Double-click any word to look up its meaning.
• Definitions include information about grammar, usage, idioms and phrasal verbs.

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Macmillan Dictionary

The Macmillan Dictionary (www.macmillandictionary.com) is a monolingual dictionary for intermediate-level learners of English.

• Headwords are all defined using a 2500-word defining vocabulary. (You can see the defining vocabulary listed here.)
• You can listen to recorded pronunciations of headwords.
• For most words in a definition, clicking a word will look up its meaning.

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Cambridge Learner's Dictionary

The Cambridge Learner's Dictionary (at dictionary.cambridge.org) is a monolingual dictionary for intermediate-level learners of English.

• Headwords are all defined using a 2000-word defining vocabulary.
• You can listen to British (UK) and American (US) pronunciations of headwords.
• For most words in a definition, clicking a word will look up its meaning.
• You can see translations of the headword or look it up in several bilingual dictionaries.

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Longman Dictionary of Contemporary English

The Longman Dictionary of Contemporary English (www.ldoceonline.com) is a monolingual dictionary for intermediate to advanced learners of English.

• Headwords are all defined using the 2000-word Longman Defining Vocabulary. (This is the same set of 2000 words explained in the Learn These Words First dictionary.)
• Double-click any word to look up its meaning.
• Definitions include information about grammar, usage, idioms and phrasal verbs.

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Other learner's dictionaries

The Learn These Words First dictionary explains 2400 headwords using a 360-word defining vocabulary (for beginning-level learners).

You can look up many additional headwords in larger learner's dictionaries, which often use between 2000 and 3000 words in their defining vocabularies (for intermediate-level learners).

Tip: When you look up a word in an intermediate or advanced dictionary, if the definition contains some unfamiliar words, you can copy and paste the definition into the Word Finding Tool. It can show you where to find a simple explanation for each word used in the definition.

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