Making decisions unilaterally or exercising authority on one’s own without consultation; arbitrary decision/act.
部長の専断でプロジェクトが中止になった。
The project was stopped by the manager's unilateral decision.
彼の専断的な態度がチームの不満を招いた。
His arbitrary attitude caused dissatisfaction in the team.
法律では重要事項は合議で決めるべきで、専断は避けるべきだ。
In law, important matters should be decided by consultation; unilateral decisions should be avoided.