conservation
1 n-uncount Conservation is saving and protecting the environment.
...a four-nation regional meeting on elephant conservation.
2 n-uncount Conservation is saving and protecting historical objects or works of art such as paintings, sculptures, or buildings.
Then he began his most famous work, the conservation and rebinding of the Book of Kells...
3 n-uncount The conservation of a supply of something is the careful use of it so that it lasts for a long time. ...projects aimed at promoting energy conservation.
conservation area (conservation areas plural )
1 n-count In Britain, a conservation area is an area where birds and animals are protected.
...wildlife conservation areas.
2 n-count In Britain, a conservation area is an area where old buildings are protected and new building is controlled.