1 [C] something (sometimes a rule or law) that limits the number, amount, size, freedom, etc of sb/sth 限定；限制: parking restrictions in the city centre 市中心停车的限制The government is to impose tighter restrictionson the number of immigrants permitted to settle in this country. 政府将加强限制获准定居本国的移民人数。

2 [U] the action of limiting the freedom of sb/sth 限制；约束: This ticket permits you to travel anywhere, without restriction. 凭这张票你可以到处旅游，不受限制。