1. duty - Noun
2. Duty - Proper noun
That which is due; payment.
That which a person is bound by moral obligation to do, or refrain from doing; that which one ought to do; service morally obligatory.
Hence, any assigned service or business; as, the duties of a policeman, or a soldier; to be on duty.
Specifically, obedience or submission due to parents and superiors.
Respect; reverence; regard; act of respect; homage.
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).
Tax, toll, impost, or customs; excise; any sum of money required by government to be paid on the importation, exportation, or consumption of goods.
Source: Webster's dictionaryThe first duty of a man is the seeking after and the investigation of truth. Cicero
There is no duty we so much underrated as the duty of being happy. Robert Louis Stevenson
When a stupid man is doing something he is ashamed of, he always declares that it is his duty. George Bernard Shaw
The most beautiful things in the universe are the starry heavens above us and the feeling of duty within us. Hindi Proverb
To do one's duty is to eat the prized fruit of honor. Nigerian Proverb
Duty before devotion. Mexican Proverb