Collins Cobuild English Dictionary - Price : $38.50 - Hardcover: 1950 pages - 2nd edition   Harpercollins; ISBN: 0003750299 ; Dimensions (in inches): 2.44 x 9.60 x 6.61 - Amazon.com Sales Rank : 5,226
The best dictionary for English learners. You'll find everything in it that you need: clear definitions, notes on how to use a word in a sentence, synonyms. All the examples of use are taken from original English sources, but they are easy to understand. All my students have been using it with great success, and they all enjoy it.
	Longman Dictionary of Contemporary English - Price : $32.42 - Hardcover: 1668 pages - 3rd edition   Addison-Wesley Pub Co; ISBN: 0582237513 ; Dimensions (in inches): 2.44 x 8.96 x 6.37 - Amazon.com Sales Rank : 17,020
An extremely useful dictionary written especially for students of English. The more than 60,000 definitions are easy to understand, as they are limited to only a 2,000-word vocabulary. The dictionary also has a lot of illustrations and diagrams for thematic vocabulary.
	Merriam Webster's Collegiate Dictionary - Price : $17.47 - Hardcover: 1600 pages - 10th edition Indx edition (1998)   Merriam Webster; ISBN: 0877797099 ; Dimensions (in inches): 1.96 x 9.93 x 7.42 - Amazon.com Sales Rank : 245
The best selling American dictionary. It contains over 1600 pages and gives the definitions for 160,000 words. Clear and easy to understand definitions, good examples and user-friendliness make this book a must for learners of English. All teachers will tell you that you have to start using an English-English dictionary as soon as possible - it will help you improve your English enormously.