Definition from macmillandictionary.com
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He has a duty under the terms of his contract to pay rent.
It is your duty as a parent to protect your children.
The company has a duty to its shareholders.
He has a strong sense of family duty.
I was simply doing my duty as a good citizen.
He was too unwell to carry out his administrative duties.
Police officers are often injured in the course of their duties.
The house buyer has to pay duty at 1% of the purchase price.
The duty on petrol has been raised.