Etymology
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duty (n.)

late 14c., duete, "obligatory service, that which ought to be done," also "the force of that which is morally right," from Anglo-French duete, from Old French deu "due, owed," hence "proper, just" (on the notion of "that which one is bound by natural, moral, or legal obligation to do or perform"); from Vulgar Latin *debutus, from Latin debitus, past participle of debere "to owe," originally, "keep something away from someone," from de- "away" (see de-) + habere "to have" (from PIE root *ghabh- "to give or receive"). Related: Duties.

Military sense of "a requisite service" is by 1580s. The sense of "tax or fee on imports, exports, etc." is from late 14c.; hence duty-free (adv.) "free from tax or duty" (1680s), and, as a noun, "duty-free article" (1958), "duty-free shop" (by 1980).

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Definitions of duty

duty (n.)
the social force that binds you to the courses of action demanded by that force; "every right implies a responsibility; every opportunity, an obligation; every possession, a duty"- John D.Rockefeller Jr;
we must instill a sense of duty in our children
duty (n.)
work that you are obliged to perform for moral or legal reasons;
duty (n.)
a government tax on imports or exports;
Synonyms: tariff
From wordnet.princeton.edu