footstep (Noun) — The sound of a step of someone walking. ex. "he heard footsteps on the porch"
footstep (Noun) — The act of taking a step in walking.
footstep (Noun) — The distance covered by a step. ex. "he stepped off ten footsteps from the old tree and began to dig"
footstep (Noun) — A mark of a foot or shoe on a surface. ex. "the police made casts of the footsteps in the soft earth outside the window"