pi

[paɪ]

pi Definition

• 1. the sixteenth letter of the Greek alphabet (Π, π), transliterated as ‘p’.
• 2. a mathematical constant that represents the ratio of a circle's circumference to its diameter, approximately equal to 3.14159.

Using pi: Examples

Take a moment to familiarize yourself with how "pi" can be used in various situations through the following examples!

• Example

  The symbol for pi is π.

• Example

  The value of pi is approximately 3.14.

• Example

  Calculating the area of a circle requires the use of pi.

pi Synonyms and Antonyms

Synonyms for pi

• ratio
• mathematical constant

Phrases with pi

• pi in the sky

  an unrealistic or impractical idea or scheme

  Example

  The company's plan to double its profits in one year was just pi in the sky.

• apple pi

  a pun on 'apple pie', referring to a hypothetical dessert made with apples and pi

  Example

  I'm going to bake an apple pi for Pi Day.

• life of pi

  a novel by Yann Martel about a young Indian boy who survives a shipwreck and spends months on a lifeboat with a Bengal tiger

  Example

  Have you read Life of Pi? It's a great book.

Origins of pi

from Greek 'pi', the sixteenth letter of the Greek alphabet

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Summary: pi in Brief

Pi [paɪ] is the sixteenth letter of the Greek alphabet, transliterated as 'p', and a mathematical constant that represents the ratio of a circle's circumference to its diameter, approximately equal to 3.14159. It is used in calculating the area of a circle and other geometric formulas. Phrases like 'pi in the sky' refer to unrealistic ideas, while 'apple pi' is a pun on 'apple pie' and 'life of pi' is a novel by Yann Martel.