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1. Oxford Dictionary

   pi

   • IPA[pʌɪ]

   英式

   • n.
     the sixteenth letter of the Greek alphabet (Π, π), transliterated as ‘p’.；the numerical value of the ratio of the circumference of a circle to its diameter (approximately 3.14159).
   • symbol
     the numerical value of pi.；osmotic pressure.
2. • 釋義

   n.

   名詞

   • 1. the sixteenth letter of the Greek alphabet (Π, π), transliterated as ‘p’.
   • ▪ the numerical value of the ratio of the circumference of a circle to its diameter (approximately 3.14159).
   • ▪ the sixteenth star in a constellation Pi Herculis
   • ▪ relating to or denoting an electron or orbital with one unit of angular momentum about an internuclear axis the π orbital system of the benzene molecule

   symbol

   symbol

   • 1. the numerical value of pi.
   • 2. osmotic pressure.
   • 3. mathematical product.