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A dictionary is a reference book containing an alphabetical list of words, with
information given for each word, usually including meaning,
pronunciation, and etymology.
A thesaurus is a dictionary of synonyms and antonyms.
Encyclopædia Britannica Online includes the full-text of the Encyclopædia Britannica, one of the most respected encyclopedias, published since 1768. It includes Merriam-Webster's Collegiate Dictionary, Merriam-Webster's Collegiate Thesaurus, Merriam-Webster's Dictionary of Quotations, an atlas, and World Data Analyst Online which has current and historical statistics on 217 countries of the world lets users create tables, charts, and export the information to a spreadsheet. Double click on any words in an article to go directly to the dictionary definition of that term; updated daily.