equipoise vs irregularity

equipoise

verb
  • To act or make to act as an equipoise. 

  • To cause to be or stay in equipoise. 

noun
  • A state of balance; equilibrium. 

  • A counterbalance. 

irregularity

noun
  • A violation of rules. 

  • An object or event that is not regular or ordinary. 

  • An instance of being irregular. 

  • Irregular bowel movement (e.g. diarrhea or constipation). 

  • The state or condition of being irregular, or the extent to which something is irregular. 

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