What sheep participate in

• Condition of stultifying conformity

WordNet Word definitions in WordNet
n. decision making by a group (especially in a manner that discourages creativity or individual responsibility)

Wiktionary Word definitions in Wiktionary
n. A process of reasoning or decision-making by a group, especially one characterized by uncritical acceptance of or conformity to a perceived majority view.

Wikipedia Word definitions in Wikipedia
Groupthink is a psychological phenomenon that occurs within a group of people in which the desire for harmony or conformity in the group results in an irrational or dysfunctional decision-making outcome. Group members try to minimize conflict and reach ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1959, from group (n.) + think .