stip ‧ u ‧ la ‧ tion /ˌstɪpjəˈleɪʃ ə n, ˌstɪpjʊˈleɪʃ ə n/ BrE AmE noun [uncountable and countable] formal
something that must be done, and which is stated as part of an agreement, law, or rule
stipulation that
The agreement included a stipulation that half of the money had to be spent on housing for lower-income families.