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• AlphaDictionary.com  - Free online word reference site featuring various specialty glossaries, word games, as well as language dictionaries.
• Bee Dictionary  - Offers word definitions, audio pronunciations, as well as multiple usage examples, synonyms, and antonyms.
• Cambridge Dictionaries  - Offers an online dictionary and sells a variety of dictionary products.
• CleverKeys  - Download software and get instant access to spelling checks, thesaurus, and definitions.
• Collins Dictionary  - Features a free online comprehensive English dictionary and thesaurus. Also offers bilingual French, Spanish, and German dictionaries.
• Cool Dictionary  - Webster-based dictionary with pronunciation audios. Also makes use of Wiktionary and Wikipedia resources.
• Creative Glossary  - Definitions for hundreds of words related to creative endeavors.
• DefineItFast  - Not your typical web-based dictionary. The use of AJAX makes the search for definitions both fast and interactive.
• Definitions.net  - Online dictionary providing instant lookup and translations of word and phrase definitions, complete with images
• Dictionary Link  - Guide to free online dictionaries and translation services. Also provides links to thesauri and encyclopedias.
• Dictionary.com  - Vocabulary database with thesauri and encyclopedia articles. Also presents articles, games, and a host of other language resources.
• Die.net Online Dictionary  - Fast and free dictionary offering cross-referenced definitions with results form WordNet, Webster's, FOLDOC, and various other references.
• ESL Dictionaries and References  - Selection of detachable and free resources for learning the English language. With direct links to other online dictionaries.
• Free Dictionary  - Online English dictionary that gives English definitions, synonyms, pronunciation, and spelling with auto suggestion and auto spell check.
• Gabby's Wordspeller  - Phonetic dictionary enables searching for word meanings and spellings using a spelling of how the word sounds like, not how it should be written.
• Hyperdictionary  - Contains English, computer, dream, and medical dictionaries. With a thesaurus.
• Inogolo  - Offers phonetic and audio pronunciations of a variety of people names, places, and other miscellaneous things.
• iTools  - Presents dictionary and thesaurus tools, as well as translation, currency exchange, and geographical search functions.
• Lexipedia  - Provides definitions as well as a visual representation of related words, categorized by nouns, verbs, synonyms, antonyms, and other related categories.
• Longman English Dictionary  - Contemporary English dictionary. Includes pronunciation guides and example sentences.
• Luciferous Logolepsy  - Dictionary filled with obscure English words and their definitions.
• Macmillan Dictionary  - Online dictionary and thesaurus featuring pronunciation guides and real usage examples and notes. Also presents current buzzwords.
• Merriam-Webster Online  - Official Merriam website presents an online dictionary, word games, a daily crossword, and more. Access to more word definitions requires subscription to premium services.
• Mnemonic Dictionary  - Provides you with the meaning of a word but also provides a key mnemonic to retain that meaning for long time in your memory.
• Newbury House Dictionary of American English  - Complete English vocabulary resource containing over 40,000 entries. With pronunciation guides.
• One Look  - Key in a word or phrase in the provided search bar and find definitions, translations, or dictionaries.
• OneLook Reverse Dictionary  - Allows users to input phrases and then recommends words to match those phrases. Also offers pattern search.
• Phrays  - Offers a word of the day, the definition, and the ability to use it in a sentence.
• Pseudodictionary.com  - Slang dictionary featuring a compilation of new words, webspeak, colloquialisms, and more.
• Snappy Words  - Visual thesaurus and dictionary. Just enter words or phrases, and receive a visual map to related words and definitions.
• The Superhero Dictionary  - Resource for information about various comic, games, and TV heroes. Juxtaposes the information on superhero names' real and fiction meanings.
• Tip of My Tongue  - Online tool to help remember a particular word given a set of letters, meaning, and word length.
• Visual Dictionary Online  - Features fifteen major themes where users can access thousands of images and see words in a unique way.
• Visual Multimedia Visual Dictionary  - Find 15 themes and over 6,000 images that illustrate words and their meaning.
• Visuwords  - Online visual dictionary and thesaurus that presents words and their relationships to other similar or related words.
• Webster's Dictionary Encyclopedia  - Features a combination dictionary, thesaurus, and encyclopedia providing users with synonyms, quotes, abbreviations, and acronyms for queries.
• Word Central  - Free and fast online word query tool. With word games and daily buzzwords.
• Word Hippo  - Online reference for synonyms, antonyms,word meanings, rhymes, plural forms, and translations in a number of major foreign languages.
• Word Spy  - Searchable vocabulary database also provides detailed information on word usage and citations.
• Word Thrill  - Free online dictionary listing definitions and synonyms for hundreds of thousands of words in the English language.
• Wordnik  - Offers word definitions from 3 major dictionaries, as well as usage examples from across the web, related photos, and links to recent posts on Twitter.
• Words Without Words  - Visual dictionary of words with abstract, complex, or underused meanings.
• WordWeb Online  - International dictionary covering American, British, Australian, Canadian, and Asian English spellings and word variations.
• yourDictionary.com  - Complete online portal for language and language-related products and services with more than 1800 dictionaries in 250 languages.
• ZebraWords  - Offers an easy to use dictionary, and thesaurus, and translation tools.