In a 1998 essay, sexologist [https://en.wikipedia.org/wiki/Volkmar_Sigusch Volkmar Sigusch] cites his own 1991 article "Die Transsexuellen und unser nosomorpher Blick" ("Transsexuals and our nosomorphic view") as the origin of the term "cissexual,"<ref name=volkmar/> which might be a precursor to "cisgender."
The terms cisgender and cissexual were used in a 2006 article in the ''Journal of Lesbian Studies'' entitled ''Debating Trans Inclusion in the Feminist Movement: A Trans-Positive Analysis''<ref name=green/> and in Julia Serano's 2007 book
[https://en.wikipedia.org/wiki/Whipping_Girl ''Whipping Girl: A Transsexual Woman on Sexism and the Scapegoating of Femininity'' ].<ref name=serano/> These works are attributed with the popularization of the term among English-speaking activists and academics.<ref name=popularity/>
A Google Trends analysis shows that interest in the term ''cisgender'' was virtually nonexistent in the years prior to 2010. After a gradual increase towards 2014, a sudden spike in interest can be seen in February 2014, and further occasional spikes along with a general increase in the years after.<ref name=gtrends/>
== References ==