pi 1 [ pahy ] SHOW IPA / paɪ / PHONETIC RESPELLING noun, plural pis. the 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+.
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Origin of pi 1
pî, peî; used in mathematics to represent Greek periphérion periphery Other definitions for pi (2 of 5) pi 2 or pie [ pahy ] SHOW IPA / paɪ / PHONETIC RESPELLING noun, plural pies. printing types mixed together indiscriminately. any confused mixture; jumble. verb (used with object), pied, pi·ing. to reduce (printing types) to a state of confusion. to jumble. Origin of pi 2
First recorded in 1650–60; origin uncertain
Other definitions for pi (3 of 5) Law. personal injury. principal investigator. Other definitions for pi (4 of 5) Other definitions for pi (5 of 5)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
How to use pi in a sentence British Dictionary definitions for pi (1 of 4) noun plural pis 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 Word Origin for pi
C18 (mathematical use): representing the first letter of Greek
periphereia periphery British Dictionary definitions for pi (2 of 4) noun plural pies a jumbled pile of printer's type a jumbled mixture verb pies, piing, pied, pies, pieing or pied (tr) to spill and mix (set type) indiscriminately to mix up Word Origin for pi
C17: of uncertain origin
British Dictionary definitions for pi (3 of 4) British Dictionary definitions for pi (4 of 4) abbreviation for Philippine Islands private investigator
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Scientific definitions for pi 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
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.