annotation vs obiter dictum

annotation

noun
  • The process of writing such comment or commentary. 

  • Information relating to the genetic structure of sequences of bases. 

  • A critical or explanatory commentary or analysis. 

  • Metadata added to a document or program. 

  • A comment added to a text. 

obiter dictum

noun
  • An incidental remark; especially (law) a statement or remark in a court's judgment that is not essential to the disposition of the case. 

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