a basic truth or law or assumption | the preservation and careful management of the environment and of natural resources |
a rule or standard especially of good behavior | (physics) the maintenance of a certain quantities unchanged during chemical reactions or physical transformations |
(law) an explanation of the fundamental reasons (especially an explanation of the working of some device in terms of laws of nature) | an occurrence of improvement by virtue of preventing loss or injury or other change |
a basic generalization that is accepted as true and that can be used as a basis for reasoning or conduct | |
a rule or law concerning a natural phenomenon or the function of a complex system | |
rule of personal conduct | |