pi - Definitions from Dictionary.com

21 results for: pi

Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

pi1

–noun, plural pis.

1.	the 16th letter of the Greek alphabet (II, π).

2.	the consonant sound represented by this letter.

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; < Gk pǐ, peǐ; used in mathematics to represent Gk periphérion periphery

]

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

Encyclopædia Britannica, Inc.
pi

To learn more about pi visit Britannica.com

Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

pi2

Audio Help [pahy] Pronunciation Key noun, plural pies, verb, pied, pi·ing.

–noun

1.	printing types mixed together indiscriminately.

2.	any confused mixture; jumble.

–verb (used with object)

3.	to reduce (printing types) to a state of confusion.

4.	to jumble.

Also, pie.

[Origin: 1650–60; orig. uncert.

]

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

1.	Law. personal injury.

2.	principal investigator.

3.	private investigator.

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

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Pi.

piaster.

Also, pi.

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

P.I.

1.	Philippine Islands.

2.	Also, p.i. private investigator.

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

American Heritage Dictionary - Cite This Source - Share This

pi¹ Audio Help (pī) Pronunciation Key
n.

also (pē) The 16th letter of the Greek alphabet. See Table at alphabet.
Mathematics A transcendental number, approximately 3.14159, represented by the symbol π, that expresses the ratio of the circumference to the diameter of a circle and appears as a constant in many mathematical expressions.

[Late Greek pī, from Greek pei, of Phoenician origin; see p in Semitic roots.]

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

American Heritage Dictionary - Cite This Source - Share This

pi² also pie Audio Help   (pī) Pronunciation Key
n.   pl. pis also pies
An amount of type that has been jumbled or thrown together at random.

v.   pied (pīd) also pied, pi·ing also pie·ing, pies also pies

v.   tr.
To jumble or mix up (type).

v.   intr.
To become jumbled.

[Origin unknown.]

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

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PI
abbr. private investigator

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

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private investigator
n. Abbr. PI
A person privately hired to do investigative or detective work. Also called private detective, private eye.

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

Online Etymology Dictionary - Cite This Source - Share This
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).

WordNet - Cite This Source - Share This

pi
noun
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 [syn: private detective]
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]

The American Heritage Science Dictionary - Cite This Source - Share This

pi Audio Help (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.

American Heritage New Dictionary of Cultural Literacy, Third Edition - Cite This Source - Share This
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.

[Chapter:] Physical Sciences and Mathematics

Free On-line Dictionary of Computing - Cite This Source - Share This

PI
An interface between Prolog application programs and the X Window System that aims to be independent from the Prolog engine, provided that it has a Quintus foreign function interface (e.g. SICStus and YAP). It is mostly written in Prolog and is divided in two libraries: Edipo - the lower level interface to the Xlib functions; and Ytoolkit - the higher level user interface toolkit.
(ftp://ftp.ncc.up.pt/pub/prolog/ytoolkit.tar.Z).
E-mail: Ze' Paulo Leal .
(1993-03-02)

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Pi\ (p[imac]), n. [Gr. pi^.]

1. A Greek letter ([Pi], [pi]) corresponding to the Roman letter P.

2. Specif.: (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 eight decimal places, is 3.14159265. The quotient pi cannot be expressed as a root of an algebraic equation; 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's Revised Unabridged Dictionary - Cite This Source - Share This

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

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

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.]

American Heritage Abbreviations Dictionary 3rd Edition - Cite This Source - Share This

pi
Pali