increase vs retardation

increase

noun
  • For a quantity, the act or process of becoming larger 

  • The creation of one or more new stitches; see Increase (knitting). 

  • Offspring, progeny 

  • An amount by which a quantity is increased. 

verb
  • To multiply by the production of young; to be fertile, fruitful, or prolific. 

  • To become more nearly full; to show more of the surface; to wax. 

  • To make (a quantity, etc.) larger. 

  • (of a quantity, etc.) To become larger or greater. 

retardation

noun
  • The act of diminishing the rate of speed. 

  • 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. 

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