1) Walk 2) Walking 3) Walking about 
• (n.) The act of walking.
Am`bu·la'tion noun [ Latin ambulatio .] The act of walking. Sir T. Browne. 
[n] - walking about
ambulate, ambulation 1. To walk about or to move (walk) from place to place. 2. To walk or move from one place to another.ambulation To move from place to place by walking.
noun walking about; `the hospital encouraged early ambulation`
The ability to walk and move about freely.