conservation conservation /ˌkɑːnsɝˈveɪʃən/

noun

1. () An occurrence of improvement by virtue of preventing loss, injury or other change  ( preservation , conservation )
   an occurrence of improvement by virtue of preventing loss, injury or other change
   
2. () The preservation and careful management of the environment and of natural resources  ( conservation )
   the preservation and careful management of the environment and of natural resources
   
3. (physics) the maintenance of a certain quantities unchanged during chemical reactions or physical transformations  ( conservation )
   (physics) the maintenance of a certain quantities unchanged during chemical reactions or physical transformations