Which of the following dictionaries would you recommend? Please let us know the reason(s) for your choice.

1: Collins COBUILD Dictionary

2: Oxford Advanced Learner's Dictionary

3: Cambridge Advanced Learner's Dictionary

4: Longman Dictionary of Contemporary English

5: Macmillan English Dictionary for Advanced Learners

I have used first three dictionaries. I would recommend Collins COBUILD Dictionary for its very easy-to-understand definitions.
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I agree on #1-- and it uses an interesting corpus; I use it in tandem with my Merriam-Webster Collegiate, actually. If a student is at the level of 'advanced learner', however, I suggest that s/he move right up to one of the standard English Dictionaries-- an Oxford or M-W of appropriate size. I consider these 'advanced learner' dictionaries an unnecessary crutch at that level.
I suggest that you use Longman because it has more examples and collocations than the other dictionaries that you`ve mentioned.
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I don't recommend 1st one at all. It explains everything in a very long way, and it is complicated to find other forms and stuff like that. Only one good point about it, I think, is the example sentences -they are fine.

I think Longman or Oxford would be pretty good [Y]
I bought the Oxford. I wish I had bought the Longman though. They are both good, and they are actually the best, but the Longman is simpler to understand if you need to know how to express yourself. The Cambridge is not as good as the others.
Then it depends if you need to learn American English or British English. The Oxford and the Longman are good for both varieties.

I'd also like to disagree with MM. I think that "standard dictionaries" (only definitions) are not for learners at any level, they are for natives. I think learners should use them only if they are at a native level, that is maybe never. I think that even most natives don't find a "standard dictionary" easy to use or useful. Learner's dictionaries are enough, because if you can't find a word in those, it means it really must be uncommon and chances are many natives don't know it either. There are exceptions though: technical terms. In learner's dictionaries you're not going to find "polynomial", for example, so I always need to check Merriam-Webster online to know the pronunciation. Do you really think learners don't need learner's dictionaries once they reach a certain level, MM? I'd like to know what level, and what kind of learner can achieve that level, how they can, and how long it takes. I'm interested, and since you are a teacher... I'm asking you. Emotion: smile
Oxford is very good. I also use Longman -> http://pewebdic2.cw.idm.fr / Is it a full version?
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Kooyeen, you are right standard dictionaries are for natives. Though I never knew this, I came to know this today. I have been using American Heritage Dictionary and Merriam-Webster's Dictionary since I started to learn English. I agree Longman's dictionary is superb. People who are saying Collin's dictionary is not a good one, I doubt they haven't used it or they just used it for a very short time. It's a fantastic dictionary.

I have a question. Most dictionaries use term ''Advanced learner...''. I'm not a advanced learner, I'm simply a learner, so are there any dictionaries for learners who aren't advanced?
Jackson6612I have a question. Most dictionaries use term ''Advanced learner...''. I'm not a advanced learner, I'm simply a learner, so are there any dictionaries for learners who aren't advanced?
Yes, but they just list less words, there's not a big difference, so I wouldn't recommend them instead of those for advanced learners.
If you can write that way and you understand the genaral meaning of the posts in this forum, you are advanced enough to use a dictionary for advanced learners. So don't worry, I'd say you are already an advanced learner. Emotion: smile
Hey Kooyeen,

Thanks for the information. Well, thank you for considering me an advanced learner. May I know what other books, books for English usage and English grammar etc., you use to improve your already very good English?
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