pi
/paɪ/
noun
- The 16th letter of the Greek alphabet (Π, π).
- In fraternity names, pi is a common letter.
- He wrote the symbol for pi on the chalkboard.
- The Greek letter pi is often used in mathematics.
- The mathematical constant (approximately 3.14159) representing the ratio of a circle's circumference to its diameter.
- Students celebrate Pi Day on March 14th because the date matches 3.14.
- To find the area of a circle, multiply pi by the radius squared.
- Pi is an irrational number, meaning its decimal never ends.