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2 definitions found
 for Rule of three
From The Collaborative International Dictionary of English v.0.48 :

  Rule \Rule\, n. [OE. reule, riule, OF. riule, reule, F.
     r['e]gle, fr. L. regula a ruler, rule, model, fr. regere,
     rectum, to lead straight, to direct. See Right, a., and cf.
     Regular.]
     1. That which is prescribed or laid down as a guide for
        conduct or action; a governing direction for a specific
        purpose; an authoritative enactment; a regulation; a
        prescription; a precept; as, the rules of various
        societies; the rules governing a school; a rule of
        etiquette or propriety; the rules of cricket.
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              We profess to have embraced a religion which
              contains the most exact rules for the government of
              our lives.                            --Tillotson.
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     2. Hence:
        (a) Uniform or established course of things.
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                  'T is against the rule of nature. --Shak.
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        (b) Systematic method or practice; as, my ule is to rise
            at six o'clock.
        (c) Ordibary course of procedure; usual way; comon state
            or condition of things; as, it is a rule to which
            there are many exeptions.
        (d) Conduct in general; behavior. [Obs.]
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                  This uncivil rule; she shall know of it. --Shak.
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     3. The act of ruling; administration of law; government;
        empire; authority; control.
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              Obey them that have the rule over you. --Heb. xiii.
                                                    17.
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              His stern rule the groaning land obeyed. --Pope.
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     4. (Law) An order regulating the practice of the courts, or
        an order made between parties to an action or a suit.
        --Wharton.
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     5. (Math.) A determinate method prescribed for performing any
        operation and producing a certain result; as, a rule for
        extracting the cube root.
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     6. (Gram.) A general principle concerning the formation or
        use of words, or a concise statement thereof; thus, it is
        a rule in England, that s or es, added to a noun in the
        singular number, forms the plural of that noun; but "man"
        forms its plural "men", and is an exception to the rule.
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     7.
        (a) A straight strip of wood, metal, or the like, which
            serves as a guide in drawing a straight line; a ruler.
        (b) A measuring instrument consisting of a graduated bar
            of wood, ivory, metal, or the like, which is usually
            marked so as to show inches and fractions of an inch,
            and jointed so that it may be folded compactly.
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                  A judicious artist will use his eye, but he will
                  trust only to his rule.           --South.
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     8. (Print.)
        (a) A thin plate of metal (usually brass) of the same
            height as the type, and used for printing lines, as
            between columns on the same page, or in tabular work.
        (b) A composing rule. See under Conposing.
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     As a rule, as a general thing; in the main; usually; as, he
        behaves well, as a rule.
  
     Board rule, Caliber rule, etc. See under Board,
        Caliber, etc.
  
     Rule joint, a knuckle joint having shoulders that abut when
        the connected pieces come in line with each other, and
        thus permit folding in one direction only.
  
     Rule of the road (Law), any of the various regulations
        imposed upon travelers by land or water for their mutual
        convenience or safety. In the United States it is a rule
        of the road that land travelers passing in opposite
        directions shall turn out each to his own right, and
        generally that overtaking persons or vehicles shall turn
        out to the left; in England the rule for vehicles (but not
        for pedestrians) is the opposite of this.
  
     Rule of three (Arith.), that rule which directs, when three
        terms are given, how to find a fourth, which shall have
        the same ratio to the third term as the second has to the
        first; proportion. See Proportion, 5
        (b) .
  
     Rule of thumb, any rude process or operation, like that of
        using the thumb as a rule in measuring; hence, judgment
        and practical experience as distinguished from scientific
        knowledge.
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From The Collaborative International Dictionary of English v.0.48 :

  Three \Three\, n.
     1. The number greater by a unit than two; three units or
        objects.
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     2. A symbol representing three units, as 3 or iii.
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     Rule of three. (Arith.) See under Rule, n.
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