Collins COBUILD Essential English Dictionary by John Sinclair
Aimed at students at early intermediate level and above this dictionary contains over 45000 references, almost 50000 examples and a checklist of all words used ten times or more in the dictionary explanations. There is full page treatment of key grammar and aspects of language use. The COBUILD format with the special extra column gives basic syntax and information on style and usage. Pronunciation is given at the start of each entry.