My sister who studies to be a interpreter (native language German for English and French) asked me to give her a book for christmas. More specifically, she wants a "good English monolingual dictionary".
I asked her if she meant a specific one, but she says any good one will suffice. She suggested Pons.
Problem is, I checked and Pons doesn't have an English monolingual dictionary (or I missed it...or it's out of print).
The ones I see recommended most are the Longman Dictionary of Contemporary English and the Oxford Dictionary of English. I would go for the Oxford one personally, but what are your suggestions?