A dictionary is a reference source in print or electronic form containing words usually alphabetically arranged along with information about their forms, functions, meanings, and idiomatic uses. It can also be a reference book listing alphabetically terms or names important to a particular subject or activity along with discussion of their meanings and uses. Additionally, a dictionary can be a reference book listing alphabetically the words of one language and showing their meanings or translations in another language.
The first known use of the word "dictionary" was in 1526. It is derived from the Latin word "dictionarium," which means "dictionary," from earlier "diction-," "dictio-" meaning "words, speaking," from the Latin verb "dicere" meaning "to say."
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