[p_ˈaɪ], [pˈa͡ɪ], [pˈaɪ]
Definitions of pi

someone who can be employed as a detective to collect information

the ratio of the circumference to the diameter of a circle

the 16th letter of the Greek alphabet

the scientist in charge of an experiment or research project

an antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs

Specif.: ( Math.) The letter /, /, as used to denote the number or quotient approximately expressing the ratio of the circumference of a circle to its diameter; also, the quotient or the ratio itself. The value of the quotient pi, to eight decimal places, is 3. 14159265. The quotient pi cannot be expressed as a root of an algebraic equation; and from this fact follows the impossibility of the quadrature of the circle by purely algebraic processes, or by the aid of a ruler and compass.

A mass of type confusedly mixed or unsorted.

To put into a mixed and disordered condition, as type; to mix and disarrange the type of; as, to pi a form.

A Greek letter (, ) corresponding to the Roman letter P.

Specif.: ( Math.) The letter , as used to denote the number or quotient approximately expressing the ratio of the circumference of a circle to its diameter; also, the quotient or the ratio itself.

Jumbled printing type.

To jumble, as type. Also, pie.

Print. Type that has been thrown into disorder.
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Usage examples for pi

As he talked to himself, he thought he heard sounds of pipes and drums coming from a distance: pi pi pi, pi pi pi. – The Adventures of Pinocchio by C. CollodiPseudonym of Carlo Lorenzini

As for the second question, the ratio of the diameter of a circle to its circumference we call pi; and though we cannot express this ratio in exact numbers, we can get sufficiently near to it for all practical purposes. – Amusements in Mathematics by Henry Ernest Dudeney

I'm awaiting my next swishing for upsetting my cup at breakfast in your defence, so I hardly think I deserve any pi jaw from you, do I? – The Bars of Iron by Ethel May Dell

Eu pi hate; Crow  pi hate. – The Dakotan Languages, and Their Relations to Other Languages by Andrew Woods Williamson

As that was Sunday we spent the morning " pi rooting" about the place. – The Prairie Wife by Arthur Stringer

Your initials are not euphonious: they recall that brainy song of my boyhood, U pi dee. – Gilbert Keith Chesterton by Maisie Ward

Well, we have been making this " pi" for a hundred years; it seems to be a national dish in considerable favor with the rest of the world even such ancient nations as China and Japan want a piece of it. – The Complete Essays of C. D. Warner by Charles Dudley Warner

He wrote again in the sand: " pi 3. 14159265...." – Eight Keys to Eden by Mark Irvin Clifton

Because, to find the area of the surface of a sphere we multiply the square of the diameter by pi; to find the volume of a sphere we multiply the cube of the diameter by one sixth of pi. – Amusements in Mathematics by Henry Ernest Dudeney

If you like we will tell you what pi is. – Frenzied Fiction by Stephen Leacock

The cavalcade was increased during the afternoon by the addition to our numbers of a dog a distinctly ugly, red haired native sort of dog, commonly called a pi dog. – A Holiday in the Happy Valley with Pen and Pencil by T. R. Swinburne

I thought it must have come from the bake shop where they do all the other pi. – The Dominant Strain by Anna Chapin Ray

Certainly it was a very tough duck, but still, I do not think a pi dog should he so fastidious. – A Holiday in the Happy Valley with Pen and Pencil by T. R. Swinburne

Think of going once to the Pi Ute spread or whatever it is! – The Landlord at Lion's Head, Complete by William Dean Howells Last Updated: February 27, 2009

When the pi ague breaks out she has scope for her fancy, and she certainly adds vivid pictures of horror and pathos to a subject which has been handled by masters of thought at different periods. – Mrs. Shelley by Lucy M. Rossetti

They do say that he was talking to Miss Walker about one of the faculty pews, and he said: 'Do you occupew this pi? – Molly Brown's Sophomore Days by Nell Speed

From out the clamor Eveley could distinguish repeated hoarse roars of " Pi i i i tcher," " Pi i i i tcher," " Ca a a a a atcher," " Ca a a a atcher," and she retired to a remote spot to await the proper moment for gathering up the remains. – Eve to the Rescue by Ethel Hueston

Upon the first or eastern mesa are located the three towns of Te wa, Si chom ovi and Wal pi. – Arizona Sketches by Joseph A. Munk

The ancestor of Pi Lo nearly destroyed our entire clan by fire. – The Chinese Fairy Book by Various

" I wonder Chip pi ti chip doesn't get tired of that song," said Dot. – Dot and the Kangaroo by Ethel C. Pedley