pi

n. 16th letter of Greek alphabet; symbol for the relation between the circumference of a circle and its diameter (Mathematics)

Pi or π is the ratio of a circle's circumference to its diameter in Euclidean geometry, approximately 3.14159. Pi is a mathematical constant and a transcendental (and therefore irrational) real number, with many uses in mathematics, physics, and engineering. It is also known as Archimedes' constant (not to be confused with an Archimedes number) and as Ludolph's number.
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Pi, or π, is the mathematical constant equal to a circle's circumference divided by its diameter. Pi may also refer to:Letter Pi (π) Pi (letter), the Greek letterLowercase π:π (film), a 1998 film directed by Darren Aronofsky. (pi function), the prime-counting functionPi bondOsmotic pressureA song from the Kate Bush album AerialShorthand for pionA men's fragrance from GivenchyThe symbol for political life used in Boethius' Consolation of PhilosophyUppercase Π:The product symbol (Pi function), the Gamma function when offset to coincide with the factorial
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Noun
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(hypernym) detective
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(synonym) principal investigator
(hypernym) scientist, man of science
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(synonym) protease inhibitor
(hypernym) antiviral, antiviral agent, antiviral drug
(hyponym) indinavir, Crixivan
(part-holonym) drug cocktail, highly active antiretroviral therapy, HAART

Noun
1. the ratio of the circumference to the diameter of a circle
(synonym) 3.14159265358979323846...
(hypernym) irrational number
2. the 16th letter of the Greek alphabet
(hypernym) letter, letter of the alphabet, alphabetic character
(member-holonym) Greek alphabet

n. pi, 16th letter of Greek alphabet; symbol for the relation between the circumference of a circle and its diameter (Mathematics)

n. pi, 16th letter of Greek alphabet; symbol for the relation between the circumference of a circle and its diameter (Mathematics)