module vs retrofit

module

noun
  • A self-contained component of a system, often interchangeable, which has a well-defined interface to the other components. 

  • A section of a program; a subroutine or group of subroutines. 

  • A pre-prepared adventure scenario with related materials for a role-playing game. 

  • A contrivance for regulating the supply of water from an irrigation channel. 

  • An independent self-contained unit of a spacecraft. 

  • A unit of education covering a single topic. 

  • An abelian group equipped with the operation of multiplication by an element of a ring (or another of certain algebraic objects), representing a generalisation of the concept of vector space with scalar multiplication. 

  • A fractal element. 

  • A file containing a music sequence that can be played in a tracker (called also mod or music module). 

  • A standard unit of measure used for determining the proportions of a building. 

retrofit

noun
  • A change made to a device, structure, etc., by introducing components or parts that were not previously available or installed. 

  • An act of supplying a device, structure, etc., with new components or parts that were not previously available or installed; a retrofitting. 

verb
  • To supply (a device, structure, etc.) with new components or parts that were not previously available or installed; to modernize. 

  • Synonym of backport (“to retroactively supply a fix or feature to a previous version of a software product at the same time or after supplying it to the current version.”) 

  • To give new characteristics or make alterations (to someone or something) to suit them to changed circumstances. 

  • To supply a device, structure, etc., with new components or parts that were not previously available or installed. 

  • To add or substitute (new components or parts) that were not previously available for or installed in a device, structure, etc. 

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