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Duty (n.) That which is due; payment.
Duty (n.) That which a person is bound by moral obligation to do, or refrain from doing; that which one ought to do; service morally obligatory.
Duty (n.) Hence, any assigned service or business; as, the duties of a policeman, or a soldier; to be on duty.
Duty (n.) Specifically, obedience or submission due to parents and superiors.
Duty (n.) Respect; reverence; regard; act of respect; homage.
Duty (n.) The efficiency of an engine, especially a steam pumping engine, as measured by work done by a certain quantity of fuel; usually, the number of pounds of water lifted one foot by one bushel of coal (94 lbs. old standard), or by 1 cwt. (112 lbs., England, or 100 lbs., United States).
Duty (n.) Tax, toll, impost, or customs; excise; any sum of money required by government to be paid on the importation, exportation, or consumption of goods.