GNU Collaborative International Dictionary of English

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Found 4 definitions 

  1.       

    Pi , n. (Chem.) The inorganic orthophoshate ion; -- a symbol used in biochemistry. [acronym] 
    PJC
    
      
    
  2.       

    Pi , n. [See Pica, Pie magpie, service-book.] (Print.) A mass of type confusedly mixed or unsorted. [Written also pie.]
    1913 Webster
    
      
    
  3.       

    Pi , n. [Gr. πῖ.]
    1. A Greek letter (Π, π) corresponding to the Roman letter P.
      Webster 1913 Suppl.
    2. Specifically: (Math.) The letter π, Π, as used to denote the number or quotient approximately expressing the ratio of the circumference of a circle to its diameter; also, the quotient or the ratio itself. The value of the quotient pi, to twenty decimal places, is 3.14159265358979323846 (see note). The number pi is an irrational number, i.e. it cannot be expressed as the quotient of two integers. It is also a transcendental number, i.e. it cannot be expressed as a root of an algebraic equation with a finite number of terms; and from this fact follows the impossibility of the quadrature of the circle by purely algebraic processes, or by the aid of a ruler and compass.
      Webster 1913 Suppl.
      +PJC
      ☞ The first 1000 decimal digits of the number pi are as displayed below.

      The digits are arranged as five sets of ten digits per line in twenty lines, proceeding left to right in each line.

      3.
      1415926535 8979323846 2643383279 5028841971 6939937510
      5820974944 5923078164 0628620899 8628034825 3421170679
      8214808651 3282306647 0938446095 5058223172 5359408128
      4811174502 8410270193 8521105559 6446229489 5493038196
      4428810975 6659334461 2847564823 3786783165 2712019091
      4564856692 3460348610 4543266482 1339360726 0249141273
      7245870066 0631558817 4881520920 9628292540 9171536436
      7892590360 0113305305 4882046652 1384146951 9415116094
      3305727036 5759591953 0921861173 8193261179 3105118548
      0744623799 6274956735 1885752724 8912279381 8301194912
      9833673362 4406566430 8602139494 6395224737 1907021798
      6094370277 0539217176 2931767523 8467481846 7669405132
      0005681271 4526356082 7785771342 7577896091 7363717872
      1468440901 2249534301 4654958537 1050792279 6892589235
      4201995611 2129021960 8640344181 5981362977 4771309960
      5187072113 4999999837 2978049951 0597317328 1609631859
      5024459455 3469083026 4252230825 3344685035 2619311881
      7101000313 7838752886 5875332083 8142061717 7669147303
      5982534904 2875546873 1159562863 8823537875 9375195778
      1857780532 1712268066 1300192787 6611195909 2164201989

      Webster 1913 Suppl.
      +PJC
    
      
    
  4.       

    Pi, v. t. [imp. & p. p. Pied ; p. pr. & vb. n. Pieing .] (Print.) To put into a mixed and disordered condition, as type; to mix and disarrange the type of; as, to pi a form. [Written also pie.]
    1913 Webster

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