# Definitions for **PI**paɪ

### This page provides all possible meanings and translations of the word **PI**

### Random House Webster's College Dictionary

pipaɪ(n.)(pl.)pis.

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

**Category:**Language/Linguisticsthe letter π, used as the symbol for the ratio of the circumference of a circle to its diameter. the ratio itself: 3.14159+.

**Category:**Math

#### Origin of **pi**:

1835–45; < Gk pî, peî; used in math to represent Gk periphérion periphery

pipaɪ(n.)(pl.)pies

or pie 1 3

(n.)printing type mixed together indiscriminately.

**Category:**Printingany confused mixture; jumble.

(v.t.)to jumble (printing type).

**Category:**Printingto mix up; jumble.

#### Origin of **pi**:

1650–60; orig. uncert.

P.I.

Philippine Islands.

**Category:**Geography (places)

### Princeton's WordNet

pi(noun)

the ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846...

private detective, PI, private eye, private investigator, operative, shamus, sherlock(noun)

someone who can be employed as a detective to collect information

principal investigator, PI(noun)

the scientist in charge of an experiment or research project

pi(noun)

the 16th letter of the Greek alphabet

protease inhibitor, PI(noun)

an antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs

### Wiktionary

pi(Noun)

The name of the sixteenth letter of the Classical and Modern Greek alphabets and the seventeenth in Old Greek.

pi(Noun)

An irrational and transcendental constant representing the ratio of the circumference of a Euclidean circle to its diameter; approximately 3.1415926535897932384626433832795; usually written u03C0.

pi(Noun)

Metal type that has been spilled, mixed together, or disordered. Also called pie.

pi(Verb)

To spill or mix printing type. Also, "to pie".

pi(Adjective)

Not part of the usual font character set; especially, non-Roman type or symbols as opposed to standard alphanumeric Roman type.

In computing, pi characters are entered with special combinations of keys like ctrl-alt-x, or via character sequences such as .

pi(Adjective)

pica (conventionally, 12 points = 1 pica, 6 picas = 1 inch)

In computing, pi characters are entered with special combinations of keys like ctrl-alt-x, or via character sequences such as .

pi(Adjective)

piaster

### Webster Dictionary

Pi(noun)

a mass of type confusedly mixed or unsorted

Pi(verb)

to put into a mixed and disordered condition, as type; to mix and disarrange the type of; as, to pi a form

### Freebase

pi

The number pi is a mathematical constant that is the ratio of a circle's circumference to its diameter, and is approximately equal to 3.14159. It has been represented by the Greek letter "π" since the mid-18th century, though it is also sometimes written as pi. π is an irrational number, which means that it cannot be expressed exactly as a ratio of two integers; consequently, its decimal representation never ends and never settles into a permanent repeating pattern. The digits appear to be randomly distributed, although no proof of this has yet been discovered. π is a transcendental number – a number that is not the root of any nonzero polynomial having rational coefficients. The transcendence of π implies that it is impossible to solve the ancient challenge of squaring the circle with a compass and straight-edge. For thousands of years, mathematicians have attempted to extend their understanding of π, sometimes by computing its value to a high degree of accuracy. Before the 15th century, mathematicians such as Archimedes and Liu Hui used geometrical techniques, based on polygons, to estimate the value of π. Starting around the 15th century, new algorithms based on infinite series revolutionized the computation of π, and were used by mathematicians including Madhava of Sangamagrama, Isaac Newton, Leonhard Euler, Carl Friedrich Gauss, and Srinivasa Ramanujan.¹³

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"PI." *Definitions.net.* STANDS4 LLC, 2014. Web. 24 Nov. 2014. <http://www.definitions.net/definition/PI>.