transness       
noun [ U ] /ˈtrænz.nəs/ /ˈtrænz.nəs/
 跨性别身份
the fact of being transgender (= feeling that you are not the same gender (= sex) as the physical body you were said to have been born with)
  She is becoming more comfortable with her transness. 她越来越适应自己的跨性别身份。 
 How do you explain transness to children? 你怎么向孩子解释跨性别的概念? 
 - More examples
 - The newspaper published an article on transness.
 - She wrote a candid article offering her perspetive on transness.
 - Are you starting to doubt your transness?