# pi^{1}

[pahy]

- the 16th letter of the Greek alphabet (II, π).
- the consonant sound represented by this letter.
- Mathematics.
- the letter π, used as the symbol for the ratio of the circumference of a circle to its diameter.
- the ratio itself: 3.141592+.

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## Origin of pi^{1}

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

# pi^{2}

### or pie

[pahy]

- printing types mixed together indiscriminately.
- any confused mixture; jumble.

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- to reduce (printing types) to a state of confusion.
- to jumble.

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## Origin of pi^{2}

First recorded in 1650–60; origin uncertain

# PI

- Law. personal injury.
- principal investigator.
- Also P.I., p.i. private investigator.

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# Pi.

### or pi.

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# P.I.

- Philippine Islands.
- Also PI, p.i. private investigator.

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Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## Examples from the Web for pi

### Contemporary Examples

#### In Pi, a numbers theorist named Max Cohen decides to put a power drill through his own brain.

#### They included Yann Martel, author of Life of Pi, and Calvin Trillin.

#### Life of Pi immediately became the odds-on favorite to win, with more bets placed on it than any other Booker nominee ever.

#### She was Richard Parker in Life of Pi, a tiger who confusingly talked, and with an Indian accent, to boot.

#### PE, like fe, is another Hebrew letter, tho Greek and math people prefer their PI better.

### Historical Examples

#### Pi Hsi holds Chung-mou in rebellion; how could ye go to him, Sir?

The Sayings Of ConfuciusConfucius

#### If you'll but drop the e in pi Better on stomach pi will li.

How Doth the Simple Spelling BeeOwen Wister

#### She calls them piazzas, with the accent strong upon the "pi."

The Personality of American CitiesEdward Hungerford

#### This is pronounced as pa, pe, pi (etc.), with an aspiration.

#### Now Pi Hsi has raised the standard of rebellion in Chung-mou.

The Sayings of ConfuciusConfucius

# pi^{1}

- the 16th letter in the Greek alphabet (Π, π), a consonant, transliterated as p
- 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

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## Word Origin

C18 (mathematical use): representing the first letter of Greek periphereia periphery

# pi^{2}

### pie

- a jumbled pile of printer's type
- a jumbled mixture

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- to spill and mix (set type) indiscriminately
- to mix up

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## Word Origin

C17: of uncertain origin

# pi^{3}

- British slang short for pious (def. 2), pious (def. 3)

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# PI

- Philippine Islands
- private investigator

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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

## Word Origin and History for pi

### n.

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).

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Online Etymology Dictionary, © 2010 Douglas Harper

# pi

(pī)- The 16th letter of the Greek alphabet.

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# pI

(pē′ī′)- The pH value for the isoelectric point of a given substance in solution.

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The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

# pi

[pī]

- 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.

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The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

# 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.

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The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.