Condition, stipulation (7)
I believe the answer is:
proviso
I believe this is a double definition.
'condition' is the first definition.
(I know that proviso is a type of condition)
'stipulation' is the second definition.
(I know that proviso is a type of stipulation)
(Other definitions for proviso that I've seen before include "Condition of stipulation of an agreement" , "Stipulation (in contract)" , "Requirement" , "Clause in contract" , "Stipulated condition" .)