The Cambridge Advanced Learner's Dictionary, Fourth Edition (CALD) is a comprehensive dictionary trusted by millions of English learners worldwide. With 140,000 words, phrases, meanings, and examples, the dictionary is ideal for IELTS, BEC, and Cambridge English First, Advanced, and Proficiency exam preparation. Each dictionary entry has thesaurus sections that show related words, phrases, and synonyms for each meaning, helping learners expand their English knowledge. The dictionary is informed by the Cambridge English Corpus, ensuring that it is up-to-date and relevant.

The CALD offers a range of learning features to help learners improve their English skills. These include British and American English audio pronunciations, recorded by native speakers, a flashcard quiz to help memorize new words, and a favorites section to quickly access frequently searched words. The search history feature allows learners to revise their recent searches, while the table of English irregular verbs provides a useful reference resource.

Cambridge University Press, the publisher of CALD, is a world-leading publisher of English learning materials. Founded in the mid-16th century, the press plays a leading role in today's global educational market, publishing titles written by authors in over 100 different countries. With its reputation for quality and excellence, Cambridge University Press is a trusted source of English learning materials for learners around the world.

The CALD also offers a range of search features to help learners find the words they need. These include the ability to understand and find a word from any grammatical form, Android Share to select any text on websites or emails and share with CALD to get definitions of the words, and the ability to copy any text from other apps and choose ‘Look up clipboard’ in CALD to see meanings of words one by one. The dictionary also offers a similar words search in case of misspelling, wildcard search using “?” and “*” symbols to replace letters if unsure of the correct spelling, and anagram search (e.g. tab-bat).