dispatch vs retardation

dispatch

verb
  • To send (a shipment) with promptness. 

  • To dispose of speedily, as business; to execute quickly; to make a speedy end of; to finish; to perform. 

  • To send (a person) away hastily. 

  • To pass on for further processing, especially via a dispatch table (often with to). 

  • To rid; to free. 

  • To destroy (someone or something) quickly and efficiently. 

  • To send (an important official message) promptly, by means of a diplomat or military officer. 

  • To send (a journalist) to a place in order to report. 

noun
  • A mission by an emergency response service, typically involving attending to an emergency in the field. 

  • A message sent quickly, as a shipment, a prompt settlement of a business, or an important official message sent by a diplomat, government official, military officer, etc. 

  • The act of doing something quickly. 

  • The passing on of a message for further processing, especially through a dispatch table. 

retardation

noun
  • The distance by which one wave is behind another. 

  • The extent to which anything is retarded; the result of any retarding or delay; mental, social, or physical slowness. 

  • Deceleration; reduction in the magnitude of velocity. 

  • That which retards; an obstacle; an obstruction. 

  • Extreme stupidity. 

  • A decrease in the speed of telegraph signalling. 

  • A suspension which resolves upwards. 

  • The act of diminishing the rate of speed. 

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