Published under license with Merriam-Webster, Incorporated.
http://www.m-w.com
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The Merriam-Webster online dictionary can be found at the
website merriam-webster. On this website there are vocabulary
quizzes and word games as well as a word of the day.
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According to Merriam-Webster, it is.
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There are many different dictionaries that are published.
American Heritage is one. Merriam Webster's Collegiate is
another.