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Lookup English Definition:

pi    : [p'ɑɪ]
Pi \Pi\ (p[=e]` [imac]"), n. (Chem.)
The inorganic orthophoshate ion; -- a symbol used in
biochemistry. [acronym]
[PJC]


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


Pi \Pi\ (p[imac]), n. [Gr. pi^.]
1. A Greek letter ([Pi], [pi]) corresponding to the Roman
letter {P}.
[Webster 1913 Suppl.]

2. Specifically: (Math.) The letter [pi], [Pi], 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]

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
[Webster 1913 Suppl. PJC]


Pi \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]

pi
n 1: the ratio of the circumference to the diameter of a circle;
approximately equal to 3.14159265358979323846...
2: someone who can be employed as a detective to collect
information [synonym: {private detective}, {PI}, {private eye},
{private investigator}, {operative}, {shamus}, {sherlock}]
3: the scientist in charge of an experiment or research project
[synonym: {principal investigator}, {PI}]
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 [synonym: {protease inhibitor},
{PI}]

76 Moby Thesaurus words for "pi":
ascender, back, ball up, bastard type, beard, belly, bevel,
black letter, body, bollix up, cap, capital, case, compose,
confound, confuse, counter, descender, em, en, face,
fat-faced type, feet, font, foul up, fumble, garble, groove,
impose, italic, jumble, justify, letter, ligature, logotype,
lower case, majuscule, make up, minuscule, mix up, muck up, muddle,
nick, overrun, pi a form, pica, play hob with, point, print,
riffle, roman, sans serif, scramble, screw up, script, set,
set in print, shank, shoulder, shuffle, small cap, small capital,
snafu, snarl up, stamp, stem, tumble, type, type body, type class,
type lice, typecase, typeface, typefounders, typefoundry,
upper case



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  • Pi definition and meaning | Collins English Dictionary
    Pi is a number, approximately 3 142, which is equal to the distance round a circle divided by its width It is usually represented by the Greek letter π COBUILD Advanced English Dictionary
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    Definitions meanings of words in English with examples, synonyms, pronunciations and translations Cambridge Business English Dictionary Buy the book! Create and share your own word lists and quizzes for free! Add the power of Cambridge Dictionary to your website using our free search box widgets
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    Dictionary com is the world’s leading online source for English definitions, synonyms, word origins and etymologies, audio pronunciations, example sentences, slang phrases, idioms, word games, legal and medical terms, Word of the Day and more
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  • Pi | Define Pi at Dictionary. com
    Greek letter, from Hebrew, literally "little mouth " As the name of the mathematical constant, from 1841 in English, used in Latin 1748 by Swiss mathematician Leonhart Euler (1707-1783), as an abbreviation of Greek periphereia "periphery " For the meaning "printer's term for mixed type," see pie (3)
  • Pi | Definition of Pi by Merriam-Webster
    Pi definition is - the 16th letter of the Greek alphabet How to use pi in a sentence the 16th letter of the Greek alphabet; the symbol π denoting the ratio of the circumference of a circle to its diameter…
  • Xi definition and meaning | Collins English Dictionary
    Responses are made in answer to a question or a statement by another person in the course of conversation Like exclamations, they may be full sentences, but can also be phrases or single words
  • English - definition of English by The Free Dictionary
    Define English English synonyms, English pronunciation, English translation, English dictionary definition of English adj 1 Of, relating to, or characteristic of England or its people or culture 2 Of or relating to the English language n 1 The people of England
  • Pi - definition of pi by The Free Dictionary
    Define pi pi synonyms, pi pronunciation, pi translation, English dictionary definition of pi abbr private investigator n 1 The 16th letter of the Greek alphabet See Table at alphabet 2 Mathematics A transcendental number, approximately Pi - definition of pi by The Free Dictionary
  • mean | Definition of mean in English by Oxford Dictionaries
    ‘Frass is an arcane English word meaning the excrement or droppings of insects ’ ‘A doorway page is a page carefully designed to do well on search engine results, but is never meant to be used by humans ’ Main definitions of mean in English: mean 1 mean 2 mean 3 mean 3 noun





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