Mill, John Stuart BrE AmE
(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.