What does "green belt" mean?

Senses relating to an area of land with plants on it.; A strip of land with plants in a place which is otherwise bare.

What is a synonym for "green belt"?

Common synonyms include: transitional zone.

Pronounced //ˈɡriːn bɛlt//.

/ˈɡriːn bɛlt/ noun

noun ·Rare ·Advanced level

Noun

1
Senses relating to an area of land with plants on it.; A strip of land with plants in a place which is otherwise bare. also, attributive
2
Senses relating to an area of land with plants on it.; A strip of land on which trees are planted to protect against desertification, soil erosion, etc. also, attributive
3
Senses relating to an area of land with plants on it.; A strip of land next to a building, open space, road, etc., with plants on it, intended for exercise or recreation. also, attributive
4
Senses relating to an area of land with plants on it.; An area of agricultural land around an urban area that is protected from large-scale building. British, also, attributive
"The LCC [London County Council] would initiate the campaign for the Green Belt, which the men at the top of London Transport would support."
5
A belt which is green in colour worn by a person who has achieved a certain (usually intermediate) level of skill in a martial art, especially judo or karate; also, the level of skill represented by this belt. also, attributive
"When the club is fully developed and has a reasonable spectrum of ranks in it, the training schedule should be stable to encourage the habit of training. […] The advanced (above green belt) class meets for an additional hour, three times per week (Monday, Wednesday, and Friday)."

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6
A person who has earned the rank of green belt in a martial art. also, attributive
"After a month I distinctly remember one of the ‘green belts’ giving me a thorough but gentle working over in one of the sparring sessions, I was impressed not just with his ability to defeat me, but with the ease with which he did it."

"The LCC [London County Council] would initiate the campaign for the Green Belt, which the men at the top of London Transport would support."

From green (adjective) + belt (“band worn around the waist; thing resembling a belt, a strip or stripe”).