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pi

1 [pahy]
noun, plural pis.
1.
the 16th letter of the greek alphabet (II, π).
2.
the consonant sound represented by this letter.
3.
Mathematics.
a.
the letter π, used as the symbol for the ratio of the circumference of a circle to its diameter.
b.
the ratio itself: 3.141592+.

Origin:
1835–45; < Greek pî, peî; used in mathematics to represent Greek periphérion periphery

pie

1 [pahy]
noun
1.
a baked food having a filling of fruit, meat, pudding, etc., prepared in a pastry-lined pan or dish and often topped with a pastry crust: apple pie; meat pie.
2.
a layer cake with a filling of custard, cream jelly, or the like: chocolate cream pie.
3.
a total or whole that can be divided: They want a bigger part of the profit pie.
4.
an activity or affair: He has his finger in the political pie too.
Idioms
6.
easy as pie, extremely easy or simple.
7.
nice as pie, extremely well-behaved, agreeable, or the like: The children were nice as pie.
8.
pie in the sky,
a.
the illusory prospect of future benefits: Political promises are often pie in the sky.
b.
a state of perfect happiness; utopia: to promise pie in the sky.

Origin:
1275–1325; Middle English, of obscure origin

pielike, adjective

pi

2 [pahy]
noun, plural pies.
1.
printing types mixed together indiscriminately.
2.
any confused mixture; jumble.
verb (used with object), pied, piing.
3.
to reduce (printing types) to a state of confusion.
4.
to jumble.
Also, pie.


Origin:
1650–60; origin uncertain

pie

2 [pahy]
noun

Origin:
1200–50; Middle English < Old French < Latin pīca, akin to pīcus woodpecker

pie

3 [pahy]
noun, verb (used with object), pied, pieing.
pi2.

pie

4 [pahy]
noun
(in England before the Reformation) a book of ecclesiastical rules for finding the particulars of the service for the day.
Also, pye.


Origin:
1470–80; translation of Latin pīca pie2; the allusion is obscure; cf. pica1

pie

5 [pahy]
noun
a former bronze coin of India, the 12th part of an anna.
Compare naya paisa, paisa, pice.


Origin:
1855–60; < Marathi pā'ī literally, a fourth

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pi1 (paɪ)
 
n , pl pis
1.  the 16th letter in the Greek alphabet (Π, π), a consonant, transliterated as p
2.  maths a transcendental number, fundamental to mathematics, that is the ratio of the circumference of a circle to its diameter. Approximate value: 3.141 592…; symbol: π
 
[C18 (mathematical use): representing the first letter of Greek periphereiaperiphery]

pi or pie2 (paɪ)
 
n , pl pies
1.  a jumbled pile of printer's type
2.  a jumbled mixture
 
vb , pies, pies, piing, pied, pies, pieing, pied
3.  to spill and mix (set type) indiscriminately
4.  to mix up
 
[C17: of uncertain origin]
 
pie or pie2
 
n
 
vb
 
[C17: of uncertain origin]

pi3 (paɪ)
 
adj
slang (Brit) pious short for pious

PI
 
abbreviation for
1.  Philippine Islands
2.  private investigator

pie1 (paɪ)
 
n
1.  a baked food consisting of a sweet or savoury filling in a pastry-lined dish, often covered with a pastry crust
2.  have a finger in the pie
 a.  to have an interest in or take part in some activity
 b.  to meddle or interfere
3.  pie in the sky illusory hope or promise of some future good; false optimism
 
[C14: of obscure origin]

pie2 (paɪ)
 
n
an archaic or dialect name for magpie
 
[C13: via Old French from Latin pīca magpie; related to Latin pīcus woodpecker]

pie3 (paɪ)
 
n, —vb
printing a variant spelling of pi

pie4 (paɪ)
 
n
a very small former Indian coin worth one third of a pice
 
[C19: from Hindi pā'ī, from Sanskrit pādikā a fourth]

pie or pye5 (paɪ)
 
n
history a book for finding the Church service for any particular day
 
[C15: from Medieval Latin pica almanac; see pica1]
 
pye or pye5
 
n
 
[C15: from Medieval Latin pica almanac; see pica1]

pie6 (paɪ)
 
adj
informal (NZ) be pie on to be keen on
 
[from Māori pai ana]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

pi
1841, used in L. 1748 by Swiss mathematician Leonhart Euler (1707-83), from Gk. letter pi (from Heb., lit. "little mouth") as an abbreviation of Gk. periphereia "periphery." For the meaning "printer's term for mixed type," see pie (3).

pie
"pastry," c.1300, from M.L. pie "meat or fish enclosed in pastry," perhaps related to M.L. pia "pie, pastry," also possibly connected with pica "magpie" (see pie (2)) on notion of the bird's habit of collecting miscellaneous objects. Not known outside Eng., except Gaelic pighe,
which is from Eng. In the Middle Ages, a pie had many ingredients, a pastry but one. Fruit pies began to appear c.1600. Fig. sense of "something easy" is from 1889. Pie-eyed "drunk" is from 1904. Phrase pie in the sky is 1911, from Joe Hill's Wobbly parody of hymns. Pieman is not attested earlier than the nursery rhyme "Simple Simon" (c.1820).

pie
"magpie," mid-13c., from O.Fr. pie (13c.), from L. pica "magpie," related to picus "woodpecker," Umbrian peica "the magpie," Skt. pikah "Indian cuckoo," O.N. spætr, Ger. Specht "woodpecker" (see magpie).

pie
printers' slang for "a mass of type jumbled together" (also pi, pye), 1659, perhaps from pie (1) on notion of a "medley," or pie (2) (see pica).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pi (pī)
n. pl. pis

Symbol π The 16th letter of the greek alphabet.

pI (pē'ī')
n.
The pH value for the isoelectric point of a given substance in solution.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
pi   (pī)  Pronunciation Key 
An irrational number that has a numerical value of 3.14159265358979... and is represented by the symbol π. It expresses the ratio of the circumference to the diameter of a circle and appears in many mathematical expressions.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
pi [(peye)]

The irrational number obtained by dividing the length of the diameter of a circle into its circumference. Pi is approximately 3.1416. The sign for pi is π.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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American Heritage
Abbreviations & Acronyms
pi
Pali
Pi
inorganic phosphate
PI
  1. performance indicator

  2. politically incorrect

  3. present illness

  4. primary infertility

  5. principal investigator

  6. private investigator

PIE
Proto-Indo-European
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Having fingers in many pies is important because if you go after enough grants
  you will usually win one, and grants beget grants.
Excellent when mixed with other apples in pies as well.
Perhaps being beat to the punch on whoopie pies left them disillusioned.
Big farm breakfasts-especially biscuits and gravy-are mandatory, and tangy
  fried apple pies are a regional specialty.
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