Conjuratio
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
In old English law
A swearing together; an oath administered to several together; a combination or confederacy under oath.
Cowell.
In old European law. A compact of the inhabitants of a commune, or municipallty, confirmed by their oaths to each other and which was the basis of the commune.
Steph. Leet. 119.