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  2. Principle - Wikipedia

    en.wikipedia.org/wiki/Principle

    A principle is a fundamental truth or proposition that serves as the foundation for a system of beliefs or behavior or a chain of reasoning. [2] That is a guide for behavior or evaluation. In law, it is a rule that has to be or usually is to be followed. It can be desirably followed, or it can be an inevitable consequence of something, such as ...

  3. Principal investigator - Wikipedia

    en.wikipedia.org/wiki/Principal_investigator

    Principal investigator. In many countries, the term principal investigator ( PI) refers to the holder of an independent grant and the lead researcher for the grant project, usually in the sciences, such as a laboratory study or a clinical trial. The phrase is also often used as a synonym for "head of the laboratory" or "research group leader".

  4. Philosophiæ Naturalis Principia Mathematica - Wikipedia

    en.wikipedia.org/wiki/Philosophiæ_Naturalis...

    Philosophiæ Naturalis Principia Mathematica at Wikisource. Philosophiæ Naturalis Principia Mathematica (English: The Mathematical Principles of Natural Philosophy) [1] often referred to as simply the Principia ( / prɪnˈsɪpiə, prɪnˈkɪpiə / ), is a book by Isaac Newton that expounds Newton's laws of motion and his law of universal ...

  5. First principle - Wikipedia

    en.wikipedia.org/wiki/First_principle

    First principle. In philosophy and science, a first principle is a basic proposition or assumption that cannot be deduced from any other proposition or assumption. First principles in philosophy are from first cause [1] attitudes and taught by Aristotelians, and nuanced versions of first principles are referred to as postulates by Kantians. [2 ...

  6. Id, ego and superego - Wikipedia

    en.wikipedia.org/wiki/Id,_ego_and_superego

    Originally, Freud used the word ego to mean the sense of self, but later expanded it to include psychic functions such as judgment, tolerance, reality testing, control, planning, defense, synthesis of information, intellectual functioning, and memory. The ego is the organizing principle upon which thoughts and interpretations of the world are ...

  7. Thesaurus - Wikipedia

    en.wikipedia.org/wiki/Thesaurus

    A thesaurus (pl.: thesauri or thesauruses), sometimes called a synonym dictionary or dictionary of synonyms, is a reference work which arranges words by their meanings (or in simpler terms, a book where you can find different words with same meanings to other words), sometimes as a hierarchy of broader and narrower terms, sometimes simply as lists of synonyms and antonyms.

  8. Synonym - Wikipedia

    en.wikipedia.org/wiki/Synonym

    Synonym list in cuneiform on a clay tablet, Neo-Assyrian period. A synonym is a word, morpheme, or phrase that means exactly or nearly the same as another word, morpheme, or phrase in a given language. For example, in the English language, the words begin, start, commence, and initiate are all synonyms of one another: they are synonymous. The ...

  9. Utilitarianism - Wikipedia

    en.wikipedia.org/wiki/Utilitarianism

    Utilitarianism is a version of consequentialism, which states that the consequences of any action are the only standard of right and wrong. Unlike other forms of consequentialism, such as egoism and altruism, utilitarianism considers either the interests of all humanity and/or all sentient beings equally.