Doublethink means the power of holding two contradictory beliefs in one's mind simultaneously, and accepting both of them.
George OrwellTo know and not to know, to be conscious of complete truthfulneยญss while telling carefully constructeยญd lies, to hold simultaneoยญusly two opinions which cancelled out, knowing them to be contradictยญory and believing in both of them, to use logic against logic, to repudiate morality while laying claim to it, to believe that democracy was impossible and that the Party was the guardian of democracy.
George Orwell