A dictionary is a list of words with their definitions, a list of characters with its glyph or a list of words with corresponding words in other languages. Many dictionaries also provide pronunciation information, word derivations, histories, or etymologies, illustrations, usage guidance, and examples in sentences.
Dictionaries of alphabetic languages list words in alphabetical order. With non-alphabetic languages, it may be different. The order in a dictionary with ideographic entries such as Chinese character is often troublesome and controversial because each character has different readings. Collation systems for logographs do exist. In Japanese and Korean, words containing Chinese characters (called Kanji in Japanese and Hanja in Korean) can be spelled in Hiragana and Hangul respectively, and so are inserted in their proper alphabetical order in dictionaries, alongside words not derived from Chinese characters. Furthermore, in entries for words derived from characters, the main entry words are spelled in Hiragana (for Japanese dictionaries) and Hangul (for Korean dictionaries), with the Chinese characters inserted in parentheses after each entry word.
Another variant is the glossary, an alphabetical list of defined terms in a specialized field, such as medicine or science. The simplest dictionary, a defining dictionary, provides a core glossary of the simplest meanings of the simplest concepts. From these, other concepts can be explained and defined, in particular for those who are first learning a language. In English the commercial defining dictionaries typically include only one or two meanings of under 2000 words. With these, the rest of English, and even the 4000 most common English idioms and metaphors, can be defined.
Most modern dictionaries are descriptive, although many, such as the American Heritage dictionaries make extensive efforts to provide information on the best usage, and almost all dictionaries provide some information on words considered erroneous, vulgar, or easily confused. In any case, in the long run, usage alone determines the meaning of words, although dictionaries provide conservative continuity, even the most descriptive.
Noah Webster's dictionary was published by the G&C Merriam Company of Springfield, Massachusetts which still publishes Merriam-Webster dictionaries, but the term Webster's is considered generic and can be used by any dictionary.
Picture Dictionary Online Picture Dictionary with search function. Uses pictures and symbols from Universal Picture Language. Grasp the meaning of a word with just a glance at its representative picture.
Open Dictionary Offers various definitions, translations and pronunciations in many languages (uses Wiktionary and WordNet for most of its entries).
An open content dictionary project is the GNU Collaborative International Dictionary of English (GCIDE). This dictionary uses Webster's Revised Unabridged Dictionary (1913) and WordNet as its sources and is being developed collaboratively under the terms of the GNU General Public License. It describes itself as "a freely-available set of ASCII files containing the marked-up text of a substantial English dictionary".
The CMU Pronouncing Dictionary A machine-readable pronunciation dictionary for North American English that contains over 100,000 words and their transcriptions. http://www.speech.cs.cmu.edu/cgi-bin/cmudict
Roger's Reference - A Complete Homonym and Homophone Dictionary Dictionary of words that are phonetically identical but which have different meanings. Now includes over 5000 homonyms and homophones, with meanings and cross-references. http://rogersreference.com/
AsifSound vs. Spelling - American Dictionary Spelling glossary indexed by its abstract grouping pronunciation (=Asifsound). AsifSound consists of 12 sound symbols. This is made from CMU Pronouncing Dictionary. http://www5d.biglobe.ne.jp/~the_imai/asifsound_dict.htm
American Homophones List of American English words that sound the same (or very nearly the same) but are spelled differently. http://www.peak.org/~jeremy/dictionary/chapters/homophones.html
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