a novel by George Orwell which is a satire (=a humorous criticism) on the Russian Revolution and Communist society. In the book, a group of animals take control of a farm so that they can establish a society where they are all equal. The pigs, however, soon become the leaders and say that they are more important, intelligent etc than everyone else, using the phrase "All animals are equal, but some animals are more equal than others."
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
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