Longman Dictionary of American English, 4th Edition
The 4th edition of the Longman Dictionary of American English has been researched and revised to meet the real needs of learners of English. The up-dated text now includes thousands of words for content areas such as Science, Economics and Social Science, as well as Word Origins and updated thesaurus boxes that give extra help with vocabulary acquisition.
All Longman dictionaries are based on the authentic language data in the Longman Corpus Network. This unique computerized language database now contains over 400 million words from all types of written texts, and from real conversations recorded across the US. The Corpus tells us how frequently words and phrases are used, so there is no guesswork in deciding which ones students need to know most.
The Corpus also shows which grammar patterns are the most important to illustrate, which important new words and idioms people use every day, and which words are frequently used together (collocations). We take our example sentences from the Corpus, and this makes the language come alive as never before.
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