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An online dictionary is a dictionary that is accessible via the Internet through a web browser. They can be made available in a number of ways: free, free with a paid subscription for extended or more professional content, or a paid-only service. Some online dictionaries are organized as lists of words, similar to a glossary, while others offer search features, reverse lookups, and additional language tools and content such as verb conjugations, grammar references, and discussion forums. ==Selected online English dictionaries== The following is a concise list of online English dictionaries whose definitions are based upon well-established content. * Collins Online Dictionary ''Collins Unabridged English Dictionary; Collins Unabridged Thesaurus; Collins Webster's American English Dictionary'' * Dictionary.com ''Dictionary.com Unabridged v. 1.1'' and ''American Heritage Dictionary of the English Language, Fourth Ed.'' * Merriam-Webster OnLine ''Merriam-Webster Online Dictionary'' * Oxford Dictionaries Online ''Oxford Dictionary of English; New Oxford American Dictionary; Oxford Thesaurus of English; Oxford American Writer's Thesaurus'' 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of online dictionaries」の詳細全文を読む スポンサード リンク
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