Longman Dictionary of Contemporary English was first published by Longman in 1978. The dictionary is available in various formats: paper only; paper with a bundled premium website; online access only or a gratis online version. LDOCE is an advanced learner's dictionary, providing definitions by using a restricted vocabulary, helping non-native English speakers to understand meanings easily. The latest version of Longman Dictionary of Contemporary English is the sixth edition. The premium website was revised during 2014 and 2015 and offers over a million corpus examples, exceeding that of the paper version and also supplying sound files for every word and 88,000 example sentences, along with various tools for study, teaching, examinations and grammar. The 9000 most important English words to learn have been highlighted via the Longman Communication 9000. The free LDOCE online was updated to its current layout in 2008 and offers a search, definitions; collocations; many examples and pictures.
A key feature of the LDOCE is its utilization of the Longman Defining Vocabulary, a 2000-word controlled defining vocabulary used to write all of the definitions in the dictionary. This defining vocabulary was developed from Michael West's General Service List of high-frequency words and their most common meanings. The controlled defining vocabulary is not only helpful to second-language learners, but has also facilitated the use of the LDOCE as a machine-readable dictionary in computational linguistics research.
Third edition: Includes 80,000 entries, over 200 usage topics, 24 pages of coloured illustrations, 3,000 popular keywords, 20 Language Notes, over 150 new usage frequency tables, new IELTS vocabulary table. Optical disc includes only new contents not found in the printed LDOCE dictionary.
*Traditional Chinese version Third Edition/朗文當代高級辭典
4th edition: Includes 207,000 words, phrases, and meanings ; 155,000 usage examples, 7,000 synonyms and antonyms, over 250 usage topics, 14 pages of coloured illustrations, 3,000 popular keywords, Language Notes. Definitions use only 2000 common words. Optical disc includes contents from LDOCE and Longman Concise Chinese-English Dictionary.
5th edition: Includes 230,000 entries, 65,000 collocations, 18,000-word synonyms and antonyms, 3000 common oral and written words. New thesaurus, grammar, collocation sections. DVD supports Microsoft Windows 2000 to Windows 10, includes contents from LDOCE and Longman Concise Chinese-English Dictionary, English pronunciations, bookmarks and notes. Online contents includes online vocabulary and grammatical resources, Longman Communication 9000.
*Traditional Chinese version
**Hardcover bi-colour edition with 4 years online service +DVD
***1st? impression
LDOCE by XCome Technology Ltd.
4th edition
*Android version : Based on Longman Dictionary of Contemporary English .
