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.
In many languages, words can appear in many different forms, but only the undeclined or unconjugated form appears as the headword in most dictionaries. Dictionaries are most commonly found in the form of a book, but some newer dictionaries, like StarDict and the New Oxford American Dictionary are dictionary software running on PDAs or computers. There are also many online dictionaries accessible via the Internet.
Today, dictionaries of most languages with alphabetic and syllabic writing systems list words in lexicographic order, usually alphabetical or some analogous phonetic system. Alphabetical ordering was a rarity until the 18th century. Before alphabetical listings, dictionaries were organized by topic, i.e. a list of animals all together in one topic.
In many languages, words are grouped together according to their root word, with the roots being arranged alphabetically. If English dictionaries were arranged like this, the words "import," "export," "support," "report," "porter," "important" and "transportation" would theoretically be listed under the Latin "portare," "to carry." This method has the advantage that all words of a common origin are listed together, but the disadvantage is that one has to know the roots of the word before one can look it up. Some Hebrew, Sanskrit, and Arabic dictionaries work this way.
While most of Japanese and Korean dictionaries are arranged according to their phonetic writing (kana syllabic script for the Japanese, and hangul alphabet for the Korean), the main body of modern Chinese dictionaries mostly is ordered according to the latin alphabet with the pinyin spelling; but most Chinese dictionaries have an appendix ordering entries accordance to the Chinese logographic writing system, in order to allow readers to find words written in logograms whose pronunciation is not known. Chinese characters may be sorted according to one of many schemes based on the component parts of the characters (radicals, number of strokes, overall shape).
Dictionaries can vary widely in coverage, size, and scope. A maximizing dictionary lists as many words as possible from a particular speech community (e.g., the Oxford English Dictionary), whereas a minimizing dictionary exclusively attempts to cover only a limited selection of words from a speech community (e.g., a dictionary of Basic English words). Take for instance, two dictionaries of Chinese characters: the pocket-sized minimizing dictionary Xinhua Zidian (2004, 700 pages) only includes 11,200 commonly used characters, while the multi-volume maximizing dictionary Hanyu Da Zidian (1995, 5800 pages) includes over 54,678 characters and variants. |