a novel written in 1962 by the British writer Anthony Burgess, about a group of young men who live in a future time and behave in a very violent way. It was made into a film by Stanley Kubrick in 1971, but he stopped allowing it to be shown in the UK because he believed that people were copying the violent actions of the actors in the film.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
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