pi

noun
UK: /paɪ/
US: /paɪ/

  1. A number that is approximately 3.14159, representing the ratio of a circle's circumference to its diameter.

    1. We use pi to find the area of a circle.
    2. Calculating the exact value of pi has fascinated mathematicians for centuries because it is irrational.

Frequently Asked Questions

The phonetic transcription of "pi" is /paɪ/ in British English and /paɪ/ in American English. Click the 🔊 button to hear both pronunciations.

Example usage of "pi": "We use pi to find the area of a circle.". More examples on the page.