duty vs excess

duty

noun
  • 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). 

excess

noun
  • An act of eating or drinking more than enough. 

  • Spherical excess, the amount by which the sum of the three angles of a spherical triangle exceeds two right angles. The spherical excess is proportional to the area of the triangle. 

  • The degree or amount by which one thing or number exceeds another; remainder. 

  • The state of surpassing or going beyond a limit; the state of being beyond sufficiency, necessity, or duty; more than what is usual or proper. 

  • A condition on an insurance policy by which the insured pays for a part of the claim. 

adj
  • More than is normal, necessary or specified. 

verb
  • To declare (an employee) surplus to requirements, such that he or she might not be given work. 

How often have the words duty and excess occurred in a corpus of books? (source: Google Ngram Viewer )