This is a useful little tid-bit of info, courtesy of Princeton University.
http://www.princeton.edu/~achaney/tmve/wiki100k/docs/Cisgender.html
Know not only the theory, but it’s origins my friends.
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Francis Roy's Blog 
I’m not surprised that it’s only really been in use since 1994 or so. It’s a useful term, but not one I ever hear in daily conversation (unless we count the internet).