The story
Coined by William H. Whyte in 1952, from group + think, modelled on earlier doublethink from Orwell's Nineteen Eighty-Four.
Etymology from Wiktionary, CC BY-SA 4.0.
groupthink
Today it means: A process of reasoning or decision-making by a group, especially one characterized by uncritical acceptance of or conformity to a perceived majority view. Full definition →