olemus
Wiktionary:
2 a social, legal, or moral requirement, duty, contract, or promise that compels someone to follow or avoid a particular course of action
4 (law) a legal agreement stipulating a specified action or forbearance by a party to the agreement; the document containing such agreement

ülevaateid
https://dztps.si/doc/slovar/obveznost.pdf

https://uollb.com/blog/law/obligation-vs-duty

https://www.legiscompare.fr/web/IMG/pdf/10._CH_2_Obligation_and_duty.pdf

https://en.wikipedia.org/wiki/Obligation

https://swoopfunding.com/uk/business-glossary/obligations/

https://law.adelaide.edu.au/system/files/media/documents/2020-08/Legal%20Obligation%20and%20Social%20Norms.pdf