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(often abbreviated to simply cis) Denoting or relating to a person whose self-identity conforms with the gender that corresponds to their biological sex; not transgender: Cisgender, contrast to transgender.

There are a number of derivatives of the terms in use, including cis male for "male assigned male at birth", cis female for "female assigned female at birth", analogically cis man and cis woman, as well as cissexism and cissexual assumption.