pathlength

2. In math and physics, the total distance covered along a curve or line.

We calculated the pathlength of the curved track using a formula.

3. In computing, the number of steps or links between two points in a network.

The shortest pathlength between the two computers was just three hops.

4. In optics, the distance light travels through a material, often adjusted for the material's index.

The optical pathlength changed when the light passed through the glass.