Popper, Sir Karl
From Longman Dictionary of Contemporary EnglishPopper, Sir KarlSir Karl PopperPopper, Sir Karl /kɑːl $ kɑːrl/ (1902–94) a British philosopher, born in Austria, who believed that ideas about the world must be proved scientifically. His best known book, The Open Society and its Enemies, is an attack on political systems in which the state has too much control, especially Communism.