1. plural of pi; the sixteenth letter of the Greek alphabet
Usage: commonly used in mathematics and science
2. plural of pi; the mathematical constant approximately equal to 3.14159, representing the ratio of a circle's circumference to its diameter
Usage: used in geometry and trigonometry

Examples

• The Greek alphabet includes letters like alpha, beta, and pis.
• In geometry class, we calculated the area using pis and the radius.
• The symbol pis appears frequently in advanced mathematics.
• Students learn about pis when studying circles and their properties.