courtship vs dalliance

courtship

noun
  • The act of wooing a person to enter into a romantic relationship or marriage; hence, the period during which a couple fall in love before their marriage. 

  • The behaviour exhibited by an animal to attract a mate. 

  • The act of trying to solicit a favour or support from someone. 

dalliance

noun
  • Playful flirtation; amorous play. 

  • A sexual relationship, not serious but often illicit. 

  • A wasting of time in idleness or trifles. 

  • A episode of dabbling. 

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