Outer bound (5)
I believe the answer is:
limit
(Other definitions for limit that I've seen before include "maximum number" , "Cap" , "Cutoff point" , "Place bound on" , "Outer extent" .)
I believe the answer is:
limit
(Other definitions for limit that I've seen before include "maximum number" , "Cap" , "Cutoff point" , "Place bound on" , "Outer extent" .)