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/paɪ/
Meaning & Definition
noun
The ratio of the circumference of a circle to its diameter, approximately equal to 3.14159.
In mathematics, pi is often represented by the Greek letter π.
A mathematical constant used in various formulas, especially those involving circular or periodic properties.
The formula for the area of a circle is A = πr², where r is the radius.
A symbol (π) used in mathematics to represent the aforementioned constant.
When calculating the circumference, the formula uses the symbol π to denote pi.
verb
To use the value of pi in calculations.
In the geometry class, we learned how to pi the dimensions of the circle to find its area.
Etymology
From the Greek letter π (pi), which stands for the word 'periphery' and was first used in this mathematical sense by the Welsh mathematician William Jones in 1706.
Common Phrases and Expressions
Pi Day:
March 14, celebrated in honor of the mathematical constant pi.
Cutting corners:
To do something in a cheaper or easier way, sometimes related to estimating using pi.
On the pi:
Referring to something done in a precise or careful manner, often in mathematics.
Related Words
Slang Meanings
A mathematical reference for accuracy or perfection.
He wants his calculations to be as precise as pi.
To 'pi' someone off signifies to annoy or irritate them.
Stop talking about pi; you're really pi-ing me off!