Pi (noun) Definition, Meaning & Examples

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noun, plural pis.
  1. the 16th letter of the Greek alphabet (Π, π).
  2. the consonant sound represented by this letter.
  3. Mathematics.
    • the letter π, used as the symbol for the ratio of the circumference of a circle to its diameter.
    • the ratio itself: 3.141592+.
noun, plural pies.
  1. printing types mixed together indiscriminately.
  2. any confused mixture; jumble.
verb (used with object), pied, pi·ing.
  1. to reduce (printing types) to a state of confusion.
  2. to jumble.
  1. personal injury.
  2. principal investigator.
  3. private investigator.
abbreviation
  1. piaster.
abbreviation
  1. Philippine Islands.
  2. private investigator.
noun plural pis
  1. the 16th letter in the Greek alphabet (Π, π), a consonant, transliterated as p
  2. a transcendental number, fundamental to mathematics, that is the ratio of the circumference of a circle to its diameter. Approximate value: 3.141 592…; symbol: π
noun plural pies
  1. a jumbled pile of printer's type
  2. a jumbled mixture
verb pies, piing, pied, pies, pieing or pied (tr)
  1. to spill and mix (set type) indiscriminately
  2. to mix up
adjective
  1. British slang short for pious (def. 2), pious (def. 3)
abbreviation for
  1. Philippine Islands
  2. private investigator
    Pi (noun) Definition, Meaning & Examples

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