expansion vs recession

expansion

noun
  • An act, process, or instance of expanding. 

  • A new addition. 

  • A product to be used with a previous product. 

  • That which is expanded; expanse; extended surface. 

  • The operation of steam in a cylinder after its communication with the boiler has been cut off, by which it continues to exert pressure upon the moving piston. 

  • The replacement of a short name (e.g., acronym, initialism, alphanumeric symbol, abbreviation) with the longer name that is synonymous with it, as when spelling out acronyms to ensure clarity for a general audience. 

  • The string of text thus substituted. 

  • The fractional change in unit length per unit length per unit temperature change. 

recession

noun
  • The act or an instance of receding or withdrawing. 

  • A procedure in which an extraocular muscle is detached from the globe of the eye and reattached posteriorly. 

  • A period of low temperatures that causes a reduction in species; ice age. 

  • A period of reduced economic activity 

  • The ceremonial filing out of clergy and/or choir at the end of a church service. 

  • The act of ceding something back. 

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