English Dictionaries

Well-Known English Dictionaries

• Your Dictionary. The #1 Online Dictionary gives you definitions, thesaurus entries, spelling, pronunciation, and etymology results.

• Cambridge International Dictionaries. Online dictionaries of English, idioms, and phrasal verbs.

• Merriam-Webster Online Dictionary. Provides a free online dictionary, thesaurus, audio pronunciation, word games, and word of the day.

• Newbury House dictionary of American English. Over 40,000 entries with simple, clear definitions, and a wealth of sample sentences and idioms.

• Dictionary.com. Largest free online dictionary and audio pronunciation.

Bilingual Dictionaries

• Dictionary of Spanish. With over 54,000 entries. You can enter English word to find Spanish word or enter Spanish word to find English word. You can also hear the pronunciation of the word.

• English-French Dictionary. The dictionary contains over 75,000 terms. You can search for an English word or a French word.

• English-German Dictionary. Nearly 230,000 entries. A service provided by LEO - Link Everything Online.

• English-Japanese Dictionary. Typing in an English word and get definitions in Japanese.

• English-Korean Dictionary. Typing in an English word and get definitions in Korean.

Visual Dictionaries

• Picture Dictionary. A completely free, online multilingual picture dictionary designed for ESL students.

• Visual Dictionary Online. 20,000 terms with contextual definitions, developed by terminology experts.

• Visual Dictionary. To learn by way of image with thematic, clear and precise pages, with concise and rigorous texts.

Dictionaries of Proper Nouns

• A Pronouncing Dictionary of Proper Nouns, including a list of common names for English speakers, names of 50 states, and 43 Presidents.

• Pronunciation of Words and Phrases. Type in a word or phrase to listen to its pronunciation, including proper nouns.

Acronym

• Acronym Finder. The world's largest and most comprehensive dictionary of acronyms and abbreviations.

• Acronym. A big acronym database. New acronyms are constantly added by users.

• Acronym Guide. A Directory of Common Acronyms and Abbreviations by Topic.

Thesaurus

• Online Thesaurus. Excellent thesaurus, a dictionary of synonyms by Lexico Publishing Group, LLC.

• thesaurus.com. Quickly find accurate and up-to-date synonyms, antonyms, and related words.

• Visual Thesaurus. An online thesaurus and dictionary of over 145,000 words that
  you explore using an interactive map.

Homonym

• Homonym. The list contains homonyms as well as homophones with definintions for each word.

Other Dictionaries

• Answers. Search for definitions, pronunciation, and even translation.

• Word Reference. You can get definitions in different languages, by Michael Kellogg of WordReference.com.

• WordNet Search. An online lexical reference system whose design is inspired by current psycholinguistic theories of human lexical memory.

• Netlingo. It contains hundreds of words and definitions that describe the technology and community world of the Web.

• Online Dictionary of Computing. It contains over 13,000 hypertext links to different terms.

• Meta Dictionary. This site searches through over 400 dictionaries for the word you type in.

• The Phrase Finder. Typing a word and getting a list of phrases.

• A Multi-Purpose Dictionary. It is a dictionary where you can find rhymes, synonyms, match
  consonants, and even search for pictures for the word you type in.

• Free Online Dictionary – Comprehensive English dictionary with word
  definitions, synonyms, and antonyms.