n.; pl. Duties [ From Due. ] 1. That which is due; payment. [ Obs. as signifying a material thing. ] [ 1913 Webster ]

When thou receivest money for thy labor or ware, thou receivest thy duty. Tyndale. [ 1913 Webster ]

2. That which a person is bound by moral obligation to do, or refrain from doing; that which one ought to do; service morally obligatory. [ 1913 Webster ]

Forgetting his duty toward God, his sovereign lord, and his country. Hallam. [ 1913 Webster ]

3. Hence, any assigned service or business; as, the duties of a policeman, or a soldier; to be on duty. [ 1913 Webster ]

With records sweet of duties done. Keble. [ 1913 Webster ]

To employ him on the hardest and most imperative duty. Hallam. [ 1913 Webster ]

Duty is a graver term than obligation. A duty hardly exists to do trivial things; but there may be an obligation to do them. C. J. Smith. [ 1913 Webster ]

4. Specifically, obedience or submission due to parents and superiors. Shak. [ 1913 Webster ]

5. Respect; reverence; regard; act of respect; homage. “My duty to you.” Shak. [ 1913 Webster ]

6. (Engin.) 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). [ 1913 Webster ]

7. (Com.) Tax, toll, impost, or customs; excise; any sum of money required by government to be paid on the importation, exportation, or consumption of goods. [ 1913 Webster ]

☞ An impost on land or other real estate, and on the stock of farmers, is not called a duty, but a direct tax. [ U.S. ] [ 1913 Webster ]

Ad valorem duty, a duty which is graded according to the cost, or market value, of the article taxed. See Ad valorem. --
Specific duty, a duty of a specific sum assessed on an article without reference to its value or market. --
On duty, actually engaged in the performance of one's assigned task. [ 1913 Webster ]