- Binding in law or conscience; imposing duty or
obligation; requiring performance or forbearance of some act; -- often
followed by on or upon; as, obedience is obligatory on a soldier.
Meaning of 'obligatory' (Princeton's WordNet)
1 . obligatory
[ a]
Meaning (1): - morally or legally constraining or binding
Example in sentence:
an obligatory contribution;
attendance is obligatory
2 . obligatory
[ s]
Meaning (2): - required by obligation or compulsion or convention