PI

/pai/
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Definition
  1. Noun:
    • The 16th letter of the Greek alphabet (Π, π): The 16th letter in the Greek alphabet, used in various scientific and mathematical contexts.
    • The ratio of a circle's circumference to its diameter: A mathematical constant, an irrational number approximately equal to 3.14159, representing the ratio of a circle's circumference to its diameter.
    • A jumbled mass of printing type: In printing, a state of confusion where movable type is mixed up.
    • (Archaic/informal) A pious or sanctimonious person: Someone who is considered overly or hypocritically devout.
Usage Examples
  • Noun (Greek letter):
    • The symbol for the mathematical constant is the Greek letter pi (π).
    • In physics, pi is often used to denote various constants.
  • Noun (Mathematical constant):
    • To calculate the area of a circle, you use the formula A = πr².
    • The value of pi has been calculated to trillions of digits.
  • Noun (Printing):
    • The apprentice accidentally knocked over the type case, creating a terrible pi.
  • Noun (Archaic/Informal - pious person):
    • He was regarded as a bit of a pi, always preaching to his friends.
Advanced Usage
  • "To pi" (verb, Printing): To mix up or disarrange type.
    • Be careful not to pi the type when you're cleaning the press.
  • "Pi meson" (Physics): A subatomic particle (pion), symbolized by π.
    • The pi meson is involved in holding the atomic nucleus together.
Variants and Related Words
  • Pi (π): The standard symbol.
  • Pie (noun): A homophone; a baked dish. (Note: This is a different word, often confused in spelling).
  • Pious (adjective): Devoutly religious. (Related to the archaic meaning of 'pi').
Synonyms
  • Mathematical constant: Pi, Archimedes' constant.
  • Greek letter: The sixteenth letter.
  • Pious person (archaic): Devotee, sanctimonious person, holy Joe (informal).
Related Phrases
  • Pi day: An informal holiday celebrated on March 14th (3/14) due to the date resembling the first three digits of pi.
    • We ate pie to celebrate Pi Day in math class.
  • Pi approximation day: Celebrated on July 22nd (22/7, a common fraction approximation of pi).
  • Pi in the sky: A pun on "pie in the sky," referring to something idealistic or unrealistic, sometimes used humorously in mathematical contexts.
Idioms
  • Not worth a pi (archaic/rare): Not worth anything; worthless. (Likely derived from the printing term for jumbled, useless type).
    • His opinion on the matter is not worth a pi.
Noun
  1. an antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs
  2. the 16th letter of the Greek alphabet
  3. the scientist in charge of an experiment or research project
  4. someone who can be employed as a detective to collect information
  5. the ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846...

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