Categorization
Not based on trends
"Ungendered person"
Again, not based on trends. It’s not even the first mention of agender. Let’s take a moment to go back further in time. In 1997 the International Journal of Transgenderism (apologies for using the latter, outdated term) stated that it was also possible that a person was an “ungendered person.” In other words: a person without a gender.
UseNet
Oxford Dictionary
Designating a person who does not identify as belonging to a particular gender; of or relating to such people.
Oxford English Dictionary
Tank Girl
New York Times
Britt’s grunginess belies a warm matter-of-factness, at least when describing her journey. As she elaborated afterward, she first heard the term “bi-gender” from Kate, who found it on Tumblr. The two met at freshman orientation and bonded. In high school, Kate identified as “agender” and used the singular pronoun “they”; she now sees her gender as an “amorphous blob.”