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duty  /duti/  n. -ties 1 [C;U] responsibility, obligation: Her duty is to see that the business runs well. 2 [U] special service: jury duty, military duty 3 [C;U] a tax, esp. on imported goods See: duty-free. 4 on or off duty: working or not working (in a position of responsibility): A police officer usually wears a uniform when on duty.

Thesaurus: duty 1 assignment, job, mission, charge 3 an assessment, tariff.