Learning a new word today

I had not heard this before (or if I did, I didn't know what it referred to):

http://en.wikipedia.org/wiki/Cisgender

Cisgender From Wikipedia, the free encyclopedia

Cisgender and cissexual describe related types of gender identity where an individual's self-perception of their gender matches the sex they were assigned at birth.[1] Kristen Schilt and Laurel Westbrook define cisgender as a label for "individuals who have a match between the gender they were assigned at birth, their bodies, and their personal identity," complementing transgender.[