pro forma vs sanctioned

pro forma

noun
  • A document that shows the standard entries of a form or similar document. 

adv
  • Undertaken or performed as a perfunctory matter, in the interest of form, or for the sake of politeness. 

adj
  • Of or relating to a document of form, especially an invoice sent in advance. 

  • Occurring, undertaken, or performed as a perfunctory matter, in the interest of form, or for the sake of formality. 

  • Showing projected costs, liabilities, etc., especially as a result of an expected action or situation. 

sanctioned

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