duty-n; 4 Senses

Sense Number 1: a moral responsibility or state of obligation

Commentary: DUTY[+state][+relation][+social][+obligation][+moral]

Examples:
It is our duty to uphold the law.
He instilled a strong sense of civic duty in his children.
They have not done their duty as responsible citizens.

Mappings:
WordNet 3.0 Sense Numbers: 2

Sense Number 2: required tasks, regular work demands

Commentary: DUTY[+activity][+regular][+task][+required]

Examples:
Writing the annual financial report is a main duty of the company's chief financial officer.
He finished a second tour of duty in Iraq.
She is stressed by all her new duties at work.
The new nurse should report for duty at 6 am sharp.
Appearing at the gala is one of the Queen's official duties.

Mappings:
WordNet 3.0 Sense Numbers: 1

Sense Number 3: a government tax on imports/exports

Commentary: DUTY[+quantity][+money][+tax][+government][+import_export]

Examples:
The duties on this foreign sports car make it prohibitively expensive.
There is no duty on any merchandise bought in these duty-free shops at the airport.

Mappings:
WordNet 3.0 Sense Numbers: 3

Sense Number 4: a state of operational utility of a thing

Commentary: DUTY[+state][+operational][+utility][+of_entity]

Examples:
We got double duty out of that trip to New York.
'making the word do the duty for the thing' (Edward Sapir)
What is the duty cycle of this machine?

Mappings:
WordNet 0.0 Sense Numbers: 5