Dictionary

1pi

noun \ˈpī\
plural pis \ˈpīz\

Definition of PI

1
:  the 16th letter of the Greek alphabet — see alphabet table
2
a :  the symbol π denoting the ratio of the circumference of a circle to its diameter
b :  the ratio itself :  a transcendental number having a value rounded to eight decimal places of 3.14159265
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Origin of PI

Middle Greek, from Greek pei, of Semitic origin; akin to Hebrew pe
First Known Use: 1638

Other Alphabet Terms

cuneiform, linear, minuscule, pictograph, rune, symbology, wedge

Rhymes with PI

2pi

noun \ˈpī\
plural pies

Definition of PI

1
:  type that is spilled or mixed
2
:  a pi character or matrix

Variants of PI

pi also pie \ˈpī\

Origin of PI

origin unknown
First Known Use: circa 1659

3pi

verb
piedpi·ing or pie·ing

Definition of PI

transitive verb
:  to spill or throw (type or type matter) into disorder
intransitive verb
:  to become pied

Variants of PI

pi also pie

First Known Use of PI

1889

4pi

adjective

Definition of PI

1
:  not intended to appear in final printing <pi lines>
2
:  capable of being inserted only by hand <pi characters>

Variants of PI

pi also pie

First Known Use of PI

circa 1940

PI

abbreviation

Definition of PI

1
Philippine Islands
2
private investigator
3
programmed instruction
PI Defined for Kids

pi

noun \ˈpī\
plural pis \ˈpīz\

Definition of PI for Kids

1
:  the symbol π representing the ratio of the circumference of a circle to its diameter
2
:  the ratio itself having a value of about 3.1416

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