Longman Dictionary of American English

Clear and Comprehensive

95.000 words, phrases, and meanings, including all words on the Academic Wordlist
36.000 example sentences, including thousands of academic examples
3.500 new words for content areas such as History and Science
Clear definitions written using just 2.000 common words

The Key to Vocabulary

3.000 Thesaurus boxes explain thousands of synonyms and antonyms
Over 3.000 word origins - 10.000 on the CD-ROM
Learner's Handbook on Writing, Grammar, and Word Origins
Workbook exercises for self-study and classroom use