Pace; stage (4)
I believe the answer is:
step
I believe this is a double definition.
'pace' is the first definition.
('step' can be a synonym of 'pace')
'stage' is the second definition.
(thesaurus)
(Other definitions for step that I've seen before include "Footfall" , "Stage - pace" , "Pace; foothold" , "Stair" , "bit of a dance" .)