Sentence:  The Pupil after his Pupillarity, had granted a Diſcharge to one of the Co-tutors, which did extinguiſh the whole Debt of that Co-tutor, and conſequently of all the reſt, they being all "correi debendi", lyable by one individual <WSD>Obligation</WSD>, which cannot be Diſcharged as to one, and ſtand as to all the reſt. 
Meaning of the word marked with <WSD> tags:  A legal agreement stipulating a specified payment or action; the document containing such agreement.