pi

pi ¹  (p)

n.

1. also (p) The 16th letter of the Greek alphabet. See Table at alphabet.

2. Mathematics A transcendental number, approximately 3.14159, represented by the symbol , that expresses the ratio of the circumference to the diameter of a circle and appears as a constant in many mathematical expressions.

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

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pi ² also pie  (p) Printing

n. pl. pis also pies

An amount of type that has been jumbled or thrown together at random.

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

v.tr.

To jumble or mix up (type).

v.intr.

To become jumbled.

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[Origin unknown.]

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pi

Noun

pl pis

1. the 16th letter in the Greek alphabet (Π, π)

2. Maths a number that is the ratio of the circumference of a circle to its diameter; approximate value: 3.141 592... Symbol: π

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pi  (p)

An irrational number that has a numerical value of 3.14159265358979... and is represented by the symbol . It expresses the ratio of the circumference to the diameter of a circle and appears in many mathematical expressions.

Thesaurus

Noun	1.	pi - the ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846... transcendental number - an irrational number that is not algebraic
	2.	PI - someone who can be employed as a detective to collect information private detective, private eye, private investigator, shamus, sherlock, operative detective - an investigator engaged or employed in obtaining information not easily available to the public hotel detective, house detective, house dick - a private detective employed by a hotel or retail store inquiry agent - a private detective store detective - a private detective employed by a merchant to stop pilferage
	3.	PI - the scientist in charge of an experiment or research project principal investigator scientist - a person with advanced knowledge of one or more sciences
	4.	pi - the 16th letter of the Greek alphabet Greek alphabet - the alphabet used by ancient Greeks alphabetic character, letter of the alphabet, letter - the conventional characters of the alphabet used to represent speech; "his grandmother taught him his letters"
	5.	PI - an antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs protease inhibitor antiviral, antiviral agent, antiviral drug - any drug that destroys viruses drug cocktail, HAART, highly active antiretroviral therapy - a combination of protease inhibitors taken with reverse transcriptase inhibitors; used in treating AIDS and HIV Crixivan, indinavir - a protease inhibitor (trade name Crixivan) used for treating HIV nelfinavir, Viracept - a protease inhibitor (trade name Viracept) used in treating HIV usually in combination with other drugs Norvir, ritonavir - a protease inhibitor (trade name Norvir) used in treating HIV Invirase, saquinavir - a weak protease inhibitor (trade name Invirase) used in treating HIV