bigender vs intersex

bigender

adj
  • Having a tendency to move between feminine and masculine gender-typed behaviour depending on context. 

  • Having two genders simultaneously: both male and female. 

intersex

adj
  • Having any of a variety of inherent conditions (in a species with distinct sexes) in which one's sex characteristics differ from those of a typical male and female; for example, having sex characteristics relating to both male and female sexes. 

  • A person who can get pregnant and also impregnate someone else. 

noun
  • An individual with any of these conditions. 

  • The condition of being intersex; intersexuality. 

verb
  • To make intersex. 

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