What does RESTRAINT mean?

noun

1. the act of controlling by restraining someone or something“the unlawful restraint of trade”
2. discipline in personal and social activities“he was a model of polite restraint”
3. the state of being physically constrained“dogs should be kept under restraint”
4. a rule or condition that limits freedom“legal restraints”
5. lack of ornamentation“the room was simply decorated with great restraint”
6. a device that retards something's motion“the car did not have proper restraints fitted”