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The term that refers to the speed of walking over a certain distance is velocity. In this context, velocity specifically defines how quickly a person can move from one point to another during walking, combining both distance and the time required to cover that distance.
Cadence refers to the rate at which steps are taken, usually expressed in steps per minute, and does not directly convey the speed of walking over a distance. Acceleration measures the change in velocity over time, which describes how quickly a person can increase their speed rather than the speed itself. Stride length refers to the distance covered in one step, indicating positional measurements rather than the speed at which a distance is traversed.
By focusing on both the distance covered and the time taken to cover it, velocity provides a clear understanding of walking speed.