1.
Conservation is saving and protecting the environment.
...a four-nation regional meeting on elephant ~.
...tree-planting and other ~ projects.
N-UNCOUNT: usu with supp
2.
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 ~ and rebinding of the Book of Kells...
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3.
The ~ of a supply of something is the careful use of it so that it lasts for a long time.
...projects aimed at promoting energy ~.
N-UNCOUNT: usu with supp