What is the meaning of restraint?

noun

• The act of controlling by restraining someone or something.
  • usage: "the unlawful restraint of trade"
• Discipline in personal and social activities.
  • usage: "he was a model of polite restraint"; "she never lost control of herself"
  • synonyms: control
• The state of being physically constrained.
  • usage: "dogs should be kept under restraint"
  • synonyms: constraint
• A rule or condition that limits freedom.
  • usage: "legal restraints"; "restraints imposed on imports"
• Lack of ornamentation.
  • usage: "the room was simply decorated with great restraint"
  • synonyms: chasteness, simplicity, simpleness
• A device that retards something's motion.
  • usage: "the car did not have proper restraints fitted"
  • synonyms: constraint