Definition of "Restraint" :

noun: the act of controlling by restraining someone or something

"The unlawful restraint of trade."

noun: a device that retards something's motion

"The car did not have proper restraints fitted."

noun: lack of ornamentation

"The room was simply decorated with great restraint."

noun: discipline in personal and social activities

"He was a model of polite restraint."

noun: a rule or condition that limits freedom

"Legal restraints."

noun: the state of being physically constrained

"Dogs should be kept under restraint."