# pi

^{1}

- the 16th letter of the Greek alphabet (II, π).
- the consonant sound represented by this letter.
- 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+.

## Origin of pi

^{1}

## pi

^{2}

### or pie

- printing types mixed together indiscriminately.
- any confused mixture; jumble.

- to reduce (printing types) to a state of confusion.
- to jumble.

## Origin of pi

^{2}

## PI

- Law. personal injury.
- principal investigator.
- Also P.I., p.i. private investigator.

## Pi.

### or pi.

## P.I.

- Philippine Islands.
- Also PI, p.i. private investigator.

## Related Words for pi

sleuth, gumshoe, detective, reporter, agent, spy, informer, prosecutor, cop, eavesdropper, tail, investigator, sleuthhound, flatfoot, dick, tracker, bloodhound, fink, eye, snoop## Examples from the Web for pi

### Contemporary Examples of pi

In Pi, a numbers theorist named Max Cohen decides to put a power drill through his own brain.

They included Yann Martel, author of Life of Pi, and Calvin Trillin.

Life of Pi immediately became the odds-on favorite to win, with more bets placed on it than any other Booker nominee ever.

She was Richard Parker in Life of Pi, a tiger who confusingly talked, and with an Indian accent, to boot.

PE, like fe, is another Hebrew letter, tho Greek and math people prefer their PI better.

### Historical Examples of pi

Pi Hsi holds Chung-mou in rebellion; how could ye go to him, Sir?

The Sayings Of ConfuciusConfucius

If you'll but drop the e in pi Better on stomach pi will li.

How Doth the Simple Spelling BeeOwen Wister

She calls them piazzas, with the accent strong upon the "pi."

The Personality of American CitiesEdward Hungerford

This is pronounced as pa, pe, pi (etc.), with an aspiration.

Pi Hsi sent an invitation to Confucius, and the Master wished to go.

The Sayings of ConfuciusConfucius

## pi

^{1}

- the 16th letter in the Greek alphabet (Π, π), a consonant, transliterated as p
- maths 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

## Word Origin for pi

## pi

^{2}

### pie

- a jumbled pile of printer's type
- a jumbled mixture

- to spill and mix (set type) indiscriminately
- to mix up

## Word Origin for pi

## pi

^{3}

- British slang short for pious (def. 2), pious (def. 3)

## PI

- Philippine Islands
- private investigator

## Word Origin and History for pi

Greek letter, from Hebrew, literally "little mouth." As the name of the mathematical constant, from 1841 in English, used in Latin 1748 by Swiss mathematician Leonhart Euler (1707-1783), as an abbreviation of Greek periphereia "periphery." For the meaning "printer's term for mixed type," see pie (3).

## pi

(pī)- The 16th letter of the Greek alphabet.

## pI

(pē′ī′)- The pH value for the isoelectric point of a given substance in solution.

## pi

- An irrational number that has a numerical value of 3.14159265358979… and is represented by the symbol π. It expresses the ratio of the circumference to the diameter of a circle and appears in many mathematical expressions.

## pi

The irrational number obtained by dividing the length of the diameter of a circle into its circumference. Pi is approximately 3.1416. The sign for pi is π.