pi

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pi / pī/ • 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 (approx. 3.14159). ∎  (Pi) [followed by Latin genitive] Astron. the sixteenth star in a constellation: Pi Herculis. ∎  Chem. & Physics relating to or denoting an electron or orbital with one unit of angular momentum about an internuclear axis.• symb. ∎  (π) the numerical value of pi. ∎  (Π) osmotic pressure. ∎  (Π) mathematical product.

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