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What does pi mean?

Looking for the meaning or definition of the word pi? Here's what it means.

Noun
  1. The name of the sixteenth letter of the Classical and Modern Greek alphabets and the seventeenth in Old Greek.
  2. (mathematics) An irrational and transcendental constant representing the ratio of the circumference of a Euclidean circle to its diameter; approximately 3.14159265358979323846264338327950; usually written π.
  3. (letterpress typography) Metal type that has been spilled, mixed together, or disordered. Also called pie.
Verb
  1. (letterpress typography) To spill or mix printing type. Also, "to pie".
Adjective
  1. (typography) Not part of the usual font character set; especially, non-Roman type or symbols as opposed to standard alphanumeric Roman type.
Abbreviation
  1. (typography) pica (conventionally, 12 points = 1 pica, 6 picas = 1 inch)
  2. piaster
  3. pious
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