Obligation

[ob-li-gey-shuh n] /ˌɒb lɪˈgeɪ ʃən/

noun
1.
something by which a person is bound or obliged to do certain things, and which arises out of a sense of duty or results from custom, law, etc.
2.
something that is done or is to be done for such reasons:
to fulfill one’s obligations.
3.
a binding promise, contract, sense of duty, etc.
4.
the act of binding or obliging oneself by a promise, contract, etc.
5.
Law.

6.
any bond, note, bill, certificate, or the like, as of a government or a corporation, serving as evidence of indebtedness.
7.
an indebtedness or amount of indebtedness.
8.
a favor, service, or benefit for which gratitude is due.
9.
a debt of gratitude:
He felt an obligation to his teacher.
10.
the state of being under a debt, as of gratitude, for a favor, service, or benefit.
/ˌɒblɪˈɡeɪʃən/
noun
1.
a moral or legal requirement; duty
2.
the act of obligating or the state of being obligated
3.
(law) a legally enforceable agreement to perform some act, esp to pay money, for the benefit of another party
4.
(law)

5.
a person or thing to which one is bound morally or legally
6.
something owed in return for a service or favour
7.
a service or favour for which one is indebted