adstipulation
/adˌstɪpjʊˈleɪʃn/noun
1Agreement, (formal) assent; approval, support.
2 Roman Law. Acting as a second stipulator in a contract or bargain; the system or process by which this is done.
Origin
Late 16th century; earliest use found in James VI & I (1566–1625), king of Scotland, England, and Ireland. From classical Latin adstipulātiōn-, adstipulātiō. Compare earlier astipulation.