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A central fact about a word is how common it is. The information is particularly valuable for language learners, as it immediately indicates how important it is to learn a word. With the advent of large computerised language corpora, it is for the first time possible to meet the demand. Both Longman Dictionaries and Collins COBUILD decided to present frequency information explicitly in new editions of their learners dictionaries. The paper describes how this was done at Longman, and the various issues encountered along the way. It also compares the Longman and Collins COBUILD lists.
Adam Kilgarriff (Sun,) studied this question.