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Kids Definition. : a reference source in print or electronic form giving information about the meanings, forms, pronunciations, uses, and origins of words listed in alphabetical order. from Latin dictionarium "dictionary," from earlier diction-, dictio- "words, speaking," from dicere "to say" — related to dictate.
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Jul 2, 2011 · In the early 19th century, archaeologists borrowed the Latin word thesaurus to denote an ancient treasury, such as that in a temple. Soon after, the word was metaphorically applied to a book containing a treasury of words or information about a particular field.