The Oxford Thesaurus An A-Z Dictionary of Synonyms - dutyn.

1) responsibility, obligation, burden, onus, devoir, office, work, task, assignment, job, stint, chore, occupation, calling, function, role, part, bit, charge: Every man is expected to do his duty. 2) respect, deference, loyalty, fealty, fidelity, faithfulness, allegiance: I think she did it out of a sense of duty to her family. 3) tax, excise, tariff, impost, levy, customs: You will have to pay duty on that whisky.