What does pi mean?

Definitions for pi
paɪpi

This dictionary definitions page includes all the possible meanings, example usage and translations of the word pi.

Princeton's WordNet

  1. pinoun

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

  2. private detective, PI, private eye, private investigator, operative, shamus, sherlocknoun

    someone who can be employed as a detective to collect information

  3. principal investigator, PInoun

    the scientist in charge of an experiment or research project

  4. pinoun

    the 16th letter of the Greek alphabet

  5. protease inhibitor, PInoun

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

GCIDE

  1. Pinoun

    Specifically: (Math.) The letter

Wiktionary

  1. pinoun

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

  2. pinoun

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

  3. pinoun

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

  4. piverb

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

  5. piadjective

    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 .

  6. piadjective

    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 .

  7. piadjective

    piaster

Wikipedia

  1. Pi

    The number π (; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulas across mathematics and physics. It is an irrational number, meaning that it cannot be expressed exactly as a ratio of two integers, although fractions such as 22 7 {\displaystyle {\tfrac {22}{7}}} are commonly used to approximate it. Consequently, its decimal representation never ends, nor enters a permanently repeating pattern. It is a transcendental number, meaning that it cannot be a solution of an equation involving only sums, products, powers, and integers. The transcendence of π implies that it is impossible to solve the ancient challenge of squaring the circle with a compass and straightedge. The decimal digits of π appear to be randomly distributed, but no proof of this conjecture has been found. For thousands of years, mathematicians have attempted to extend their understanding of π, sometimes by computing its value to a high degree of accuracy. Ancient civilizations, including the Egyptians and Babylonians, required fairly accurate approximations of π for practical computations. Around 250 BC, the Greek mathematician Archimedes created an algorithm to approximate π with arbitrary accuracy. In the 5th century AD, Chinese mathematicians approximated π to seven digits, while Indian mathematicians made a five-digit approximation, both using geometrical techniques. The first computational formula for π, based on infinite series, was discovered a millennium later. The earliest known use of the Greek letter π to represent the ratio of a circle's circumference to its diameter was by the Welsh mathematician William Jones in 1706.The invention of calculus soon led to the calculation of hundreds of digits of π, enough for all practical scientific computations. Nevertheless, in the 20th and 21st centuries, mathematicians and computer scientists have pursued new approaches that, when combined with increasing computational power, extended the decimal representation of π to many trillions of digits. These computations are motivated by the development of efficient algorithms to calculate numeric series, as well as the human quest to break records. The extensive computations involved have also been used to test supercomputers. Because its definition relates to the circle, π is found in many formulae in trigonometry and geometry, especially those concerning circles, ellipses and spheres. It is also found in formulae from other topics in science, such as cosmology, fractals, thermodynamics, mechanics, and electromagnetism. In modern mathematical analysis, it is often instead defined without any reference to geometry; therefore, it also appears in areas having little to do with geometry, such as number theory and statistics. The ubiquity of π makes it one of the most widely known mathematical constants inside and outside of science. Several books devoted to π have been published, and record-setting calculations of the digits of π often result in news headlines.

ChatGPT

  1. pi

    Pi (π) is a fundamental mathematical constant that represents the ratio of a circle's circumference to its diameter. Its approximate value is 3.14159, but it is an irrational number, meaning its decimal representation goes on infinitely without repeating.

Webster Dictionary

  1. Pinoun

    a mass of type confusedly mixed or unsorted

  2. Piverb

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

  3. Etymology: [See Pica, Pie magpie, service-book.]

Wikidata

  1. 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

Chambers 20th Century Dictionary

  1. 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.]

Suggested Resources

  1. pi

    The pi symbol -- In this Symbols.com article you will learn about the meaning of the pi symbol and its characteristic.

  2. pi

    Song lyrics by pi -- Explore a large variety of song lyrics performed by pi on the Lyrics.com website.

Surnames Frequency by Census Records

  1. PI

    According to the U.S. Census Bureau, Pi is ranked #24762 in terms of the most common surnames in America.

    The Pi surname appeared 1,006 times in the 2010 census and if you were to sample 100,000 people in the United States, approximately 0 would have the surname Pi.

    64.6% or 650 total occurrences were Asian.
    19.2% or 194 total occurrences were of Hispanic origin.
    11.9% or 120 total occurrences were White.
    2% or 21 total occurrences were Black.
    2% or 21 total occurrences were of two or more races.

How to pronounce pi?

How to say pi in sign language?

Numerology

  1. Chaldean Numerology

    The numerical value of pi in Chaldean Numerology is: 9

  2. Pythagorean Numerology

    The numerical value of pi in Pythagorean Numerology is: 7

Popularity rank by frequency of use

pi#1#5315#10000

Translations for pi

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"pi." Definitions.net. STANDS4 LLC, 2024. Web. 28 Mar. 2024. <https://www.definitions.net/definition/pi>.

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