Definition of pi Pi
/pajˈ/ - [pay] -
We found 17 definitions of pi from 6 different sources.
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What does pi mean?
WordNet
NounPlural: pis |
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| pi - the 16th letter of the Greek alphabet | ||
| alphabetic character, letter of the alphabet, letter a written message addressed to a person or organization; "mailed an indignant letter to the editor" | ||
| pi - the ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846... | ||
| 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, PI | ||
| 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 | ||
| pi - someone who can be employed as a detective to collect information | ||
| private detective, PI, private eye, private investigator, operative, shamus, sherlock | ||
| detective a police officer who investigates crimes | ||
| hotel detective, house detective, house dick a private detective employed by a hotel or retail store | ||
| inquiry agent a private detective | ||
| pi - the scientist in charge of an experiment or research project | ||
| principal investigator, PI | ||
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Wiktionary 
- pi (Noun)
The name of the sixteenth letter of the Classical 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 π. - 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.
Webster DictionaryWebster's Unabridged Dictionary 📘
- pi (n.)
A mass of type confusedly mixed or unsorted. - pi (v. t.)
To put into a mixed and disordered condition, as type; to mix and disarrange the type of; as, to pi a form.
Chambers DictionaryChamber's 20th Century Dictionary 📕
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pi
Pie, pī, n. a mass of types confusedly mixed.—v.t. to reduce to a mixed mass, or to a state of pi, as types. [Cf. Pie, a magpie, &c.]
Wikipedia 
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pi is the number found when the distance around a circle (the circumference) is divided by the distance between opposite ends of the circle (the diameter).
The value of pi is around 3.141592654. A common fraction approximation of pi is formula_3, which yields 3.14285714. This approximation has an error of about 0.04%. While this approximation is sufficient for most applications, the fraction formula_4 is more accurate (giving 3.14159292), and can be used when a more precise calculation is needed.
Pi is often written as the Greek letter π. Pi is an irrational number, meaning it cannot be written as a fraction (formula_5).
This basically means that pi goes on forever, and that it is impossible to get pi exactly.
However, it is very useful in many ways, not just measuring circles.
Mathematicians have known about pi for thousands of years. The first known approximations of pi are from around 1900 BC, and are 25/8 (by the Babylonians) and 256/81 (by the Egyptians). The most common way of finding pi has been to inscribe (draw) a shape of many sides in a circle, and use the area of the polygon to find out pi. These polygons could range from 96 sides (as used by Archimedes) to more than 16,384 sides (as used by the ancient Chinese in around 500 AD.)And also it is used to work out the area and the circumference of a circle. The formula for the circumference is C(circumference)= pi times diameter. The formula for finding the area of a circle is pi (radius²).
Pi in real life.
Today, the -
disambiguation
Pi, or π, is the mathematical constant equal to a circle's circumference divided by its diameter. -
letter
Pi (uppercase/lowercase Π π), is the letter of the Greek alphabet, used to represent the "p" sound in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 80. Letters that came from it include the Roman P and Cyrillic П.
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