(1856-1939) an Austrian doctor who developed a new system for understanding the way that people's minds work, and a new way of treating mental illness called psychoanalysis. He believed that the bad experiences that people have as children can affect their mental health as adults, and that by talking to a mentally ill person about their past life and feelings, the hidden causes of their illness can be found. He wrote The Interpretation of Dreams and The Ego and the Id. His ideas, especially about the importance of sex, had a very great influence on the way that people thought in the 20th century.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
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