Meaning of “pi” in the English Dictionary

british dictionary

"pi" in British English

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pinoun

uk /paɪ/ 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

(Definition of “pi” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"pi" in American English

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pinoun [ U ]

/pɑɪ/ symbol π

geometry a number that is the ratio (= comparison) of the distance around a circle to the distance across the circle, equal to about 3.14159

(Definition of “pi” from the Cambridge Academic Content Dictionary © Cambridge University Press)

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