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conservation US English

The action of conserving something, in particular

conservation US Thesaurus

the conservation of tropical forests

conservation area US English

An area of notable environmental or historical interest or importance which is protected by law against undesirable changes

conservation of mass US English

A principle stating that mass cannot be created or destroyed

conservation of charge US English

A principle stating that the total electric charge of an isolated system is fixed

conservation of energy US English

A principle stating that energy cannot be created or destroyed, but can be altered from one form to another