[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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Quotes of pi

I hope that Requiem is better than Pi I hope that Pi is better than my student films, and I'm hoping that I'm getting better as I get older. – Darren Aronofsky

So here we have pi squared, which an engineer would call 10. – Frank King

They've been talking about Pi which I haven't seen, they've been comparing it to Usual Suspects, Sixth Sense, and Fight Club, and I didn't see that either. – Joe Pantoliano
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
Rhymes for pi
 ai, bi, bligh, buy, by, bye, chi, cry, die, dry, dye, eye, fly, fry, frye, guy, hi, high, kwai, lie, lxi, lye, mei, nigh, phi, pie, ply, pry, psi, rye, shy, sigh, sky, sly, spry, spy, sty, tai, thai, thigh, tie, try, vi, vie, why, wry, wy, ay, aye, hy, my, nye, sai, thy, wye, fae, pye, sy, tye, bly, chai, dai, kai, shai, ty, cai, mai, brye, keye, cy, jai, gae, chae, lai, ngai, sri, wai, pae, sci, fi, pri, pty, vy, nie, tae, fye, ly, phy, bae, tsai, gyi, kyi, flye, yie;
 ally, apply, awry, belie, bonsai, brunei, byebye, comply, decry, defy, deny, descry, dubai, goodbye, hereby, hifi, imply, july, nearby, rely, reply, retry, shanghai, standby, supply, thereby, untie, versailles, whereby, goodbye, kanai, mihai, uy, imai, alai, iwai, mcfly;
 misapply, overfly, underlie, resupply, dui;
 oversupply, isty, cspi;
 dwi;