duty

1 a charge usually of money collected by the government from people or businesses for public use the shop at the airport charges no duty on tourist memorabilia Synonyms assessment, tax, imposition, impost, levyRelated Words direct tax, personal tax; capitation, custom(s), excise, hidden tax, income tax, poll tax, property tax, sales tax, single tax, sin tax, tariff, toll, tribute, value-added tax, withholding tax; supertax, surcharge, surtax; death tax, estate tax, inheritance tax; flat tax, proportional tax

2 a piece of work that needs to be done regularly the regular duties of a lifeguard Synonyms assignment, chore, job, taskRelated Words chare (or char); endeavor, enterprise, project, stint, undertaking; care, charge, commission, responsibility; function, mission, office, operation, post; errand; circuit, round, route

3 something one must do because of prior agreement I must obey the call of duty and serve my country Synonyms burden, charge, commitment, devoir, do [archaic], obligation, imperative, incumbency, need, office, responsibilityRelated Words oath, pledge, promise, troth, vow, word; arrangement, prearrangement, setup; compact, contract, covenant, pact, trust; debt, payment, tribute; compulsion, constraint, restraint; must, requirement; coercion, duress, force; appointment, engagement, reservation; burden, onusNear Antonyms grace, postponement, stay; discharge, ease, exemption, release, relief, waiver; loophole; alternative, choice, option, pick, preference, selection