arc length

This term is a technical expression used primarily in geometry, calculus, and physics to describe the linear distance along a curve. It differs from the displacement or the straight-line distance (chord length) between two points, as it accounts for the actual path traveled along the curvature.

In a mathematical context, the term is treated as a singular concept. While one can discuss multiple lengths in a problem, the term itself functions as a specific measurement property of a geometric figure.