Source : Webster's Revised Unabridged Dictionary (1913)

Footfall \Foot"fall`\, n.
   A setting down of the foot; a footstep; the sound of a
   footstep. --Shak.

         Seraphim, whose footfalls tinkled on the tufted floor.
                                                  --Poe.

Source : WordNet®

footfall
     n : the sound of a step of someone walking; "he heard footsteps
         on the porch" [syn: {footstep}, {step}]