1.NounThe theory that society enforces a strict male-female gender binary, privileges masculinity and maleness over femininity and femaleness, and (when the theory is strictly construed) limits gender to a direct correspondence with assigned sex at birth.
"Understanding bigenderism may offer insight into the specific challenges faced by nonbinary people."
2.NounThe state of being bigender; the state of having two (or multiple) genders simultaneously.
"I find that bigenderism best describes my gender identity and pansexuality is a good descriptor for my sexual orientation."