The OALD11 is the largest English-language dictionary from Oxford University Press tailored specifically for non-native speakers. It is not merely a wordbook; it is a pedagogical tool that helps learners move from intermediate proficiency to advanced mastery. The 11th edition focuses on providing nuanced definitions, contextual usage, and updated terminology to bridge the gap between dictionary definitions and real-world English.
Located in the reference section, this is a hidden gem for learners. Oxford Advanced Learners Dictionary 11th Edition