n. The view that all human beings are either male or female, both in sex and in gender, and that sexual and romantic thoughts and relations are normal only when between people of different sexes.
n. Discrimination against non-heteronormative individuals.
n. Situations wherein non-heteronormative individuals are ignored or presumed to not exist.
Word Usage
"Queer theorists have sought to demonstrate that a wide range of social institutions display heteronormativity, that is, the assumption of heterosexuality and of the gender difference that defines it, as a norm."