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Mill, John Stuart
     
Mill, John Stuart
(1806-73) a British philosopher and economist who influenced modern ideas about politics and economics. He helped to develop the idea of utilitarianism (=the principle that actions are good if they generally bring happiness, and bad if they do not), and in his book On Liberty, he said that people should be free to do what they want so long as they did not harm other people.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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