Ideal for upper intermediate and advanced learners of English, this dictionary covers all the words, phrases, and idioms that students need to master in order to speak and write effective English. New to this edition is the inclusion of CEFR levels, helping learners to focus on the words that are most important. Full-sentence definitions and thousands of updated examples taken from the 4.5-billion-word Collins Corpus show learners how the words are used in authentic contexts. The dictionary offers extensive help with grammar through the inclusion of grammar patterns at examples, and includes a comprehensive supplement to help with academic and business grammar.