dilatation vs purview

dilatation

noun
  • The act of dilating; expansion; an enlarging on all sides; the state of being dilated 

  • Prolixity; diffuse discourse. 

  • A dilation or enlargement of a canal or other organ. 

purview

noun
  • Range of understanding. 

  • The scope of a statute. 

  • The enacting part of a statute. 

  • Scope or range of interest or control. 

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