DICTIONARIES & THESAURI

Cambridge Advanced Learner's Dictionary

A dictionary "for people learning English all over the world." Includes audio pronunciations for both American and British English.

Cambridge Dictionaries Online

Choose one of four dictionaries (Cambridge International Dictionary of English, Cambridge Dictionary of American English, Cambridge International Dictionary of Idioms, or Cambridge International Dictionary of Phrasal Verbs); then enter a word to read a definition.

Dictionary of Slang

Definitions and links to information about the slang of various locations and groups in the United Kingdom.

Merriam-Webster's Collegiate Dictionary

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Merriam-Webster's Collegiate Thesaurus

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YourDictionary

A comprehensive reference site featuring original definitions with example use cases, definitions from Webster and English Language dictionaries, thesauri entries from Rogets, specialty definitions, encyclopedic information, related articles, audio pronunciations, etymology, word games.