principle noun definition in Experiments and research topic from the Oxford Advanced Learner's Dictionary

principle

 noun: Experiments and research topic
1 [countable] a law, a rule or a theory that something is based on the principles and practice of writing reports The principle behind it is very simple. There are three fundamental principles of teamwork. Discussing all these details will get us nowhere; we must get back to first principles (= the most basic rules).2 [singular] a general or scientific law that explains how something works or why something happens the principle that heat rises A tidal current turbine is similar in principle to a windmill.

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