pi definition, meaning - what is pi in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “pi”

See all translations


noun uk   us   /paɪ/ (symbol Π, π)
[U] mathematics, science the number (approximately 3.14) used to calculate the size of circles [C or U] language the 16th letter of the Greek alphabet
Translations of “pi”
in Chinese (Traditional) 圓周率…
in Chinese (Simplified) 圆周率…
(Definition of pi from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of pi?
Add Cambridge dictionaries to your browser to your website

Definitions of “pi” in other dictionaries

Word of the Day

cup tie

a game between two teams trying to win a cup (= prize), especially in football

Word of the Day

What’s All The Commotion About? (Words to describe sounds)

by Kate Woodford,
May 20, 2015
​​​ In this post we look at a range of words and phrases that we use to describe noise and the absence of noise. Starting with complete quiet, we sometimes use the noun hush to describe silence: A hush fell over the room as the bride walked in./There was a deathly hush (=complete

Read More 

ancestral health noun

May 25, 2015
diet based on the presumed diet of our Palaeolithic ancestors ‘Ancestral health,’ to use a term popular among Paleo followers, has gone mass.

Read More