Collins Cobuild Advanced Dictionary of American English

With innovations such as DefinitionsPLUS and vocabulary builders, the Collins COBUILD Advanced Dictionary of American English transforms the learner's dictionary from an occasional reference into the ultimate resource and must-have dictionary for language learners. The definitions have been created using a controlled vocabulary, and each definition has been reviewed by a team of classroom teachers to ensure that they are appropriate for learners at the intermediate level.

Through a collaborative initiative, Collins COBUILD and National Geographic Learning are co-publishing a dynamic new line of learners' dictionaries offering unparalleled pedagogy and learners resources. The first Collins COBUILD dictionary was published in 1987, thanks in part to John Sinclair, one of the very first modern corpus linguists who personally oversaw the creation of the Bank of English(TM). Every COBUILD dictionary is based on the Bank of English(TM), a huge electronic database of both written and spoken language, which today contains over 650 million words.