principle /ˈpɹɪn.sɪ.pəl/noun 9verb 1forms 3phrases 1 noun9 •an idea accepted as basic and true, from which other ideas or rules followWe need some sort of principles to reason from. •A rule used to choose among solutions to a problem.The principle of least privilege holds that a process should only receive the permissions it needs. •A rule or law of nature, or the basic idea on how the laws of nature are applied.Bernoulli's principleThe Pauli Exclusion Principle prevents two fermions from occupying the same state. •Moral rule or aspect.I don't doubt your principles.You are clearly a person of principle. •A fundamental essence, particularly one producing a given quality.Many believe that life is the result of some vital principle. •A chemical compound within plant or animal tissue that is characteristic of it and more or less peculiar to it, such that it defines the character of that tissue from a human viewpoint (as for example nicotine in tobacco).Cathartine is the bitter, purgative principle of senna. — 1845 •A source, or origin; that from which anything proceeds; fundamental substance or energy; primordial substance; ultimate element, or cause.The soul of man is an active principle. — 1664 •An original faculty or endowment.those active principles whose direct and ultimate object is the communication either of enjoyment or suffering — 1828 •(no longer used) A beginning.Doubting sad end of principle unsound. — 1596 verb1 •To equip with principles; to establish, or fix, in certain principles; to impress with any tenet or rule of conduct.Let an enthusiast be principled that he or his teacher is inspired. — 1689 formsprincipled · principling · principles Phrases with principle dormitive principleA type of tautology in which an item is explained in terms of the item itself, only put in different (usually more abstract) words.