pi
1the 16th letter of the Greek alphabet (Π, π).
the consonant sound represented by this letter.
Mathematics.
the letter π, used as the symbol for the ratio of the circumference of a circle to its diameter.
the ratio itself: 3.141592+.
Origin of pi
1Other definitions for pi (2 of 5)
or pie
printing types mixed together indiscriminately.
any confused mixture; jumble.
to reduce (printing types) to a state of confusion.
to jumble.
Origin of pi
2Other definitions for PI (3 of 5)
Law. personal injury.
principal investigator.
Also P.I., p.i. private investigator.
Other definitions for Pi. (4 of 5)
piaster.
Other definitions for P.I. (5 of 5)
Philippine Islands.
Also PI, p.i. private investigator.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use pi in a sentence
Both the components of π are white, and their magnitudes are 3½ and 6.
Half-hours with the Telescope | Richard A. ProctorWhy are the decimals of a table of logarithms, why are those of the number π distributed in accordance with the laws of chance?
But as for the number π, that presents more difficulties, and I have at the moment nothing worth while to say.
This would give for the interval defining the upper limit π : 4.508, which is very nearly a fifth.
When the region is circular this problem is solved by the integral 1/π ∫ Udω − 1/π ∫ Udθ previously given.
British Dictionary definitions for pi (1 of 4)
/ (paɪ) /
the 16th letter in the Greek alphabet (Π, π), a consonant, transliterated as p
maths a transcendental number, fundamental to mathematics, that is the ratio of the circumference of a circle to its diameter. Approximate value: 3.141 592…; symbol: π
Origin of pi
1British Dictionary definitions for pi (2 of 4)
pie
/ (paɪ) /
a jumbled pile of printer's type
a jumbled mixture
to spill and mix (set type) indiscriminately
to mix up
Origin of pi
2British Dictionary definitions for pi (3 of 4)
/ (paɪ) /
British slang short for pious (def. 2), pious (def. 3)
British Dictionary definitions for PI (4 of 4)
Philippine Islands
private investigator
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for pi
[ pī ]
An irrational number that has a numerical value of 3.14159265358979… and is represented by the symbol π. It expresses the ratio of the circumference to the diameter of a circle and appears in many mathematical expressions.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Cultural definitions for pi
[ (peye) ]
The irrational number obtained by dividing the length of the diameter of a circle into its circumference. Pi is approximately 3.1416. The sign for pi is π.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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