anon vs thenceforward

anon

adv

  • At another time; then; again. 

  • Soon; in a little while. 

adj

  • anonymous 

noun

  • An anonymous person, especially an author. 

  • A work with an unknown author. 

  • A work without a title. 

thenceforward

adv

  • from then on; from that time on 

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