As others have said, it relies upon why you want it.
Progressed English Dictionaries are incredible for second language speakers with a decent handle of English. The Oxford Advanced English Dictionary and the Cambridge Advanced English Dictionary stand apart as genuine models.
My top choice, most loved word reference is the New Oxford Dictionary of English. It is a major word reference, however not generally so large as the OED or Shorter OED. The definitions are unbelievably clear, and the models are obviously worked out and extremely accommodating.
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