principle
noun
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(law) an explanation of the fundamental reasons (especially an explanation of the working of some device in terms of laws of nature)rationale
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a basic truth or law or assumption“the principles of democracy”
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a rule or law concerning a natural phenomenon or the function of a complex system“the principle of the conservation of mass”rule
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a basic generalization that is accepted as true and that can be used as a basis for reasoning or conduct“their principles of composition characterized all their works”rule
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a rule or standard especially of good behavior“They were a person of principle.”
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rule of personal conductprecept