Dictionary
Thesaurus
Encyclopedia
Translator
Web

PI

 - 17 dictionary results

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; < Gk pî, peî; used in mathematics to represent Gk periphérion periphery

pi

2[pahy] 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.

PI

1. Law. personal injury.
2. principal investigator.
3. private investigator.

Pi.

Also, pi.

P.I.

1. Philippine Islands.
2. Also, p.i. private investigator.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To PI
pi 1   (pī)   
n.  
  1. also (pē) The 16th letter of the Greek alphabet. See Table at alphabet.

  2. 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 , from Greek pei, of Phoenician origin; see p in Semitic roots.]
pi 2 also pie   (pī)   
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.]
PI  
abbr.  private investigator
private investigator  
n.   Abbr. PI
A person privately hired to do investigative or detective work. Also called private detective, private eye.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
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.
Cite This Source
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).
Online Etymology Dictionary, © 2001 Douglas Harper
Cite This Source
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.
Cite This Source
Computing Dictionary

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)

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
Cite This Source
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

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Search another word or see PI on Thesaurus | Reference
FacebookTwitterFollow us: