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pi

From Longman Dictionary of Contemporary English
Related topics: Maths, Numbers
pipi /paɪ/ noun [uncountable]  technicalHM a number that is represented by the Greek letter (π) and is equal to the distance around a circle, divided by its width
Examples from the Corpus
piA broken networked intelligence may be able to calculate pi to the billionth digit but not forward e-mail to a new address.Consider a symmetric equilibrium in which the n firms in industry i all charge a price pi.Now came the pi ce de r sistance.One of his most popular miracles occurred one day while pi owing.
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