obligation

noun

1.
the social force that binds you to the courses of action demanded by that force
mustdeed duty responsibility
Derived from:
obligate oblige
2.
the state of being obligated to do or pay something
boundness plighting
Derived from:
obligate
3.
a personal relation in which one is indebted for a service or favor
shild indebtedness
Derived from:
oblige
4.
a written promise to repay a debt
certificate of indebtedness debt instrument
5.
a legal agreement specifying a payment or action and the penalty for failure to comply
Derived from:
obligate oblige