A legal obligation.
An amount assessed on an imported or (less often) exported item, nearly equivalent to taxes, embracing all impositions or charges levied on persons or things.
A human action which is exactly conformable to the laws which require us to obey them.
It differs from a legal obligation because a duty cannot always be enforced by the law; it is our duty, for example, to be temperate in eating, but we are under no legal obligation to be so; we ought to love our neighbors, but no law obliges us to love them.
Duties may be considered in the relation of man towards God, towards himself, and towards mankind. We are bound to obey the will of God as far as we are able to discover it, because he is the sovereign Lord of the universe who made and governs all things by his almighty power, and infinite wisdom. The general name of this duty is piety, which consists in entertaining just opinions concerning him, and partly in such affections towards him and such worship of him as is suitable to these opinions.
A man has a duty to perform towards himself; he is bound by the law of nature to protect his life and his limbs; it is his duty too, to avoid all intemperance in eating and drinking, and in the unlawful gratification of all his other appetites.
He has duties to perform towards others. He is bound to do to others the same justice which he would have a right to expect them to do to him.