అర్థం : Morally or legally constraining or binding.
ఉదాహరణ :
Attendance is obligatory.
An obligatory contribution.
Possible but not necessary. Left to personal choice.
optionalఅర్థం : Required by obligation or compulsion or convention.
ఉదాహరణ :
He made all the obligatory apologies.
Obligatory meaning in Telugu.