duty
/ˈdü-tē/
noun
conduct due to parents and superiors : respect
obligatory tasks, conduct, service, or functions that arise from one's position (as in life or in a group)
assigned service or business
filial duty and obedience
adjective
done as a duty
being on duty : assigned to specified tasks or functions
pay a duty call on her elderly aunt
adjective or adverb
without payment of customs duties : free from duties
relating to or selling duty-free goods
imported duty-free