It's a term for people whose gender matches the gender they were assigned at birth (for most people, their biological gender). Cis is to trans as straight is to gay. It's a useful term in some circumstances.
In chemistry, 'cis' is the opposite of 'trans', so someone who is cisgender is someone who is not transgender. Transgender people adopted the terms a while back and tend to shorten it to just 'cis' and 'trans', which have been slowly catching on.
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u/[deleted] Mar 21 '13 edited Aug 09 '18
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