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duty

 
 
/ˈdjuːti/ noun [C, U]

Definition

RIGHT THING TO DO something you must do because it is morally or legally right: a moral duty [+ to do sth] Rail companies have a duty to provide safe transport.
JOB something you do as part of your job or because of your position: professional/official duties
on/off duty If a doctor, police officer, etc is on duty, they are working, and if they are off duty, they are not working: I'm on duty tomorrow night.
TAX tax that you pay on something you buy
(Definition of duty noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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