Meaning & Definition of word "Pi"
to
Pi
/paɪ/
noun:
- 1. The ratio of the circumference of a circle to its diameter, approximately equal to 3.14159.
- Example: In mathematics, pi is often represented by the Greek letter π.
- 2. A mathematical constant used in various formulas, especially those involving circular or periodic properties.
- Example: The formula for the area of a circle is A = πr², where r is the radius.
- 3. A symbol (π) used in mathematics to represent the aforementioned constant.
- Example: When calculating the circumference, the formula uses the symbol π to denote pi.
verb:
- 1. To use the value of pi in calculations.
- Example: 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
circle:
A round plane figure whose boundary consists of points equidistant from a fixed point (the center).
radius:
A straight line from the center to the circumference of a circle or sphere.
circumference:
The enclosing boundary of a curved geometric figure, especially a circle.
Slang Meanings of pi
Meaning: A mathematical reference for accuracy or perfection.
Example Sentence: He wants his calculations to be as precise as pi.
Meaning: To 'pi' someone off signifies to annoy or irritate them.
Example Sentence: Stop talking about pi; you're really pi-ing me off!