That which one is morally or legally obligated to do.
The state of being at work and responsible for or doing a particular task.
A tax placed on imports or exports; a tariff.
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).
Expressions that are or should be allowed in some moral or legal context.
The right to express an opinion in public without being restrained or censored.