Cis is short for “cisgendered” which means that your gender and identity corresponds with your birth gender. Most of the world is “cis” and it’s a word to provide context to “trans”.I’m unfamiliar with cis, but welcome!
Not out to anyone but my husband either. Such a difficult topic to bring up with anyone else.
It comes from the prefix meaning of trans. It’s opposites like “Herero” and “homo”. I think cis means something like “this side of” and trans means “the other side of”.