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Rule of being a free speech absolutist
(i.imgur.com)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
The Latin prefix cis- , meaning "on this side of", which is the opposite of the prefix trans- . So a cisgender person is someone whose gender identity matches the sex assigned to them at birth - I.e. someone who is not transgender.
They're value neutral words and are useful words to have. For example, if I wanted to make the point that not everyone who cares about trans rights or gender issues are transgender, I could point to myself, as a cisgender woman.