obligation
noun
[ ɒblɪˈɡeɪʃ(ə)n ]
• an act or course of action to which a person is morally or legally bound; a duty or commitment.
• "I have an obligation to look after her"
Similar:
duty,
commitment,
responsibility,
moral imperative,
function,
task,
job,
chore,
assignment,
commission,
business,
burden,
charge,
onus,
liability,
accountability,
requirement,
debt,
engagement,
office,
devoir,
trust,
compulsion,
indebtedness,
duress,
necessity,
pressure,
constraint,
Origin:
Middle English (in the sense ‘formal promise’): via Old French from Latin obligatio(n- ), from the verb obligare (see oblige).