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View synonyms for pi
pi
1[ pahy ]
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+.
pi
2or pie
[ pahy ]
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.
PI
3- Law. personal injury.
- principal investigator.
- Also P.I., p.i. private investigator.
Pi.
4or pi.
abbreviation for
- piaster.
P.I.
5abbreviation for
- Philippine Islands.
- Also PI, p.i. private investigator.
pi
1/ paɪ /
noun
- a jumbled pile of printer's type
- a jumbled mixture
verb
- to spill and mix (set type) indiscriminately
- to mix up
PI
2abbreviation for
- Philippine Islands
- private investigator
pi
3/ paɪ /
noun
- 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
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.
pi
- 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.
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Word History and Origins
Origin of pi1
First recorded in 1835–45; from Greek pî, peî, used in mathematics to represent Greek periphérion periphery ( def )
Origin of pi2
First recorded in 1650–60; origin uncertain
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Word History and Origins
Origin of pi1
C17: of uncertain origin
Origin of pi2
C18 (mathematical use): representing the first letter of Greek periphereia periphery
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Example Sentences
Both the components of π are white, and their magnitudes are 3½ and 6.
From Project Gutenberg
Why are the decimals of a table of logarithms, why are those of the number π distributed in accordance with the laws of chance?
From Project Gutenberg
But as for the number π, that presents more difficulties, and I have at the moment nothing worth while to say.
From Project Gutenberg
This would give for the interval defining the upper limit π : 4.508, which is very nearly a fifth.
From Project Gutenberg
When the region is circular this problem is solved by the integral 1/π ∫ Udω − 1/π ∫ Udθ previously given.
From Project Gutenberg
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