Definitions of restraint:

• noun:   the of act controlling by restraining someone or something

  Example: "The unlawful restraint of trade"

• noun:   a device that retards something's motion

  Example: "The car did not have proper restraints fitted"

• noun:   discipline in personal and social activities

  Example: "He was a model of polite restraint"

• noun:   a rule or condition that limits freedom

  Example: "Legal restraints"

• noun:   lack of ornamentation

  Example: "The room was simply decorated with great restraint"

• noun:   the state of being physically constrained

  Example: "Dogs should be kept under restraint"