The story
From double + think. Coined by George Orwell in 1949 as part of the Newspeak in his novel Nineteen Eighty-Four.
Etymology from Wiktionary, CC BY-SA 4.0.
doublethink
Today it means: The power of holding two contradictory beliefs in one's mind simultaneously and accepting both of them as true or correct; an instance of doing so. Full definition →