1. The term "arc" in mathematics typically refers to a portion of the circumference of a circle. 2. More specifically, an arc is a continuous part of the circle's edge between two points on the circle. 3. Arcs are measured in degrees or radians, representing the angle subtended by the arc at the center of the circle. 4. For example, if you have a circle and two points on its circumference, the arc is the path along the circle connecting those two points. 5. Arcs are important in geometry and trigonometry for calculating lengths, angles, and areas related to circles.