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English definition of “principle”

principle

noun [C/U] (MORAL RULE)   /ˈprɪn·sə·pəl/
a moral rule or standard of good behavior or fair dealing: [C] His guiding principle is that everyone should have equal access to high-quality health care. [C] He refused to compromise his principles. on principle If you believe or act on principle, you are following a personal standard of behavior: On principle, I never eat meat.
(Definition of principle noun (MORAL RULE) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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