pi /ˈpaɪ/
 圓周率;混雜的鉛字堆;混亂


 Pi n.  Print. A mass of type confusedly mixed or unsorted. [Written also pie.]


 Pi n.
 1. A Greek letter (corresponding to the Roman letter P.
 2.  Specifically: Math. The letter 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.
 Note: ☞  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

From: Webster's Revised Unabridged Dictionary (1913)

 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.]

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From: WordNet (r) 2.0

 pi
      n 1: the ratio of the circumference to the diameter of a circle
           [syn: 3.14159265358979323846...]
      2: someone who can be employed as a detective to collect
         information [syn: private detective, private eye, {private
         investigator, operative, shamus, sherlock]
      3: the scientist in charge of an experiment or research project
         [syn: principal investigator]
      4: the 16th letter of the Greek alphabet
      5: an antiviral drug used against HIV; interrupts HIV
         replication by binding and blocking HIV protease; often
         used in combination with other drugs [syn: {protease
         inhibitor]