canonical form vs normal form

canonical form

noun
  • A standard or normal presentation of a mathematical entity or a text string, etc. 

  • Any of a set of representations of the resonance structure of a molecule each of which contributes to the real structure; a contributing structure. 

  • Synonym of dictionary form 

normal form

noun
  • A standard, canonical way of presenting an object. 

  • A matrix that represents the possible outcomes of a game 

  • Any of various forms of a relational database providing criteria for determining a table's degree of vulnerability to logical inconsistencies and anomalies. 

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