formal vs joshing

formal

adj
  • Official. 

  • Relating to mere manipulation and construction of strings of symbols, without regard to their meaning. 

  • Relating to formation. 

  • Organized; well-structured and planned. 

  • Being in accord with established forms. 

  • Relating to the form or structure of something. 

  • Ceremonial or traditional. 

  • Proper, according to strict etiquette; not casual. 

noun
  • An event with a formal dress code. 

  • Formalin. 

  • A formal parameter. 

  • An evening gown. 

  • An acetal formed from formaldehyde. 

joshing

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