Definition of green belt noun from the Oxford Advanced Learner's Dictionary

 

green belt

 noun
noun
BrE
 
; NAmE
 
[uncountable, countable, usually singular](especially British English) Conservation
 
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an area of open land around a city where building is strictly controlled New roads are cutting into the green belt. Green belt development is carefully regulated. See related entries: Conservation Culture In Britain green belts are created to make sure that towns do not become too big and that there is some countryside for the people from the towns to enjoy. There are often strong protests when people are given permission to build on this land. In the US, a green belt is usually a nature area protected by a town or city. It is often a large park, with paths where people can walk. The town of Greenbelt, Maryland, was one of several created in this way in the 1930s as part of the New Deal programme of President Franklin D Roosevelt
See the Oxford Advanced American Dictionary entry: green belt