centering vs fixing

centering

noun
  • A type of formwork which serves as a temporary structure during the construction of arches and bridges. 

  • The process of moving something to a centre, normally before some other process. 

fixing

noun
  • Something to aid attachment during construction (screws, wall plugs, etc) 

  • See fixings. 

  • The act of subverting (fixing) a vote. 

verb
  • Going; preparing; ready. Only used in fixing to. 

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