First of all what is a dictionary? According to the best source of information Wikipedia:
A dictionary is a book of alphabetically listed words in a specific language, with definitions, etymologies, pronunciations, and other information, or a book of alphabetically listed words in one language with their equivalents in another, also known as a lexicon.
Dictionaries are most commonly found in the form of a book, but some newer dictionaries are dictionary software running on computers. There are also many online dictionaries accessible via the Internet.
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