Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for duty from the 1913 edition of Webster's Revised Unabridged Dictionary. Define duty using one of the most comprehensive free online dictionaries on the web.

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duty
Part of Speech: noun
Results: 7
3. Hence, any assigned service or business; as, the duties of a policeman, or a soldier; to be on duty.
4. Specifically, obedience or submission due to parents and superiors.
7. 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).
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