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2 definitions found
 for Principle of contradiction
From The Collaborative International Dictionary of English v.0.48 :

  Principle \Prin"ci*ple\, n. [F. principe, L. principium
     beginning, foundation, fr. princeps, -cipis. See Prince.]
     1. Beginning; commencement. [Obs.]
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              Doubting sad end of principle unsound. --Spenser.
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     2. A source, or origin; that from which anything proceeds;
        fundamental substance or energy; primordial substance;
        ultimate element, or cause.
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              The soul of man is an active principle. --Tillotson.
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     3. An original faculty or endowment.
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              Nature in your principles hath set [benignity].
                                                    --Chaucer.
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              Those active principles whose direct and ultimate
              object is the communication either of enjoyment or
              suffering.                            --Stewart.
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     4. A fundamental truth; a comprehensive law or doctrine, from
        which others are derived, or on which others are founded;
        a general truth; an elementary proposition; a maxim; an
        axiom; a postulate.
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              Therefore, leaving the principles of the doctrine of
              Christ, let us go on unto perfection. --Heb. vi. 1.
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              A good principle, not rightly understood, may prove
              as hurtful as a bad.                  --Milton.
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     5. A settled rule of action; a governing law of conduct; an
        opinion or belief which exercises a directing influence on
        the life and behavior; a rule (usually, a right rule) of
        conduct consistently directing one's actions; as, a person
        of no principle.
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              All kinds of dishonesty destroy our pretenses to an
              honest principle of mind.             --Law.
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     6. (Chem.) Any original inherent constituent which
        characterizes a substance, or gives it its essential
        properties, and which can usually be separated by
        analysis; -- applied especially to drugs, plant extracts,
        etc.
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              Cathartine is the bitter, purgative principle of
              senna.                                --Gregory.
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     Bitter principle, Principle of contradiction, etc. See
        under Bitter, Contradiction, etc.
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From The Collaborative International Dictionary of English v.0.48 :

  Contradiction \Con`tra*dic"tion\, n. [L. contradictio answer,
     objection: cf. F. contradiction.]
     1. An assertion of the contrary to what has been said or
        affirmed; denial of the truth of a statement or assertion;
        contrary declaration; gainsaying.
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              His fair demands
              Shall be accomplished without contradiction. --Shak.
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     2. Direct opposition or repugnancy; inconsistency;
        incongruity or contrariety; one who, or that which, is
        inconsistent.
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              can he make deathless death? That were to make
              Strange contradiction.                --Milton.
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              We state our experience and then we come to a manly
              resolution of acting in contradiction to it.
                                                    --Burke.
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              Both parts of a contradiction can not possibly be
              true.                                 --Hobbes.
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              Of contradictions infinite the slave. --Wordsworth.
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     Principle of contradiction (Logic), the axiom or law of
        thought that a thing cannot be and not be at the same
        time, or a thing must either be or not be, or the same
        attribute can not at the same time be affirmed and and
        denied of the same subject; also called the law of the
        excluded middle.
  
     Note: It develops itself in three specific forms which have
           been called the "Three Logical Axioms." First, "A is
           A." Second, "A is not Not-A" Third, "Everything is
           either A or Not-A."
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