The term "cisgender" refers to individuals whose gender identity matches the sex they were assigned at birth. For example, if someone is assigned female at birth and identifies as a woman, that person is considered cisgender. The term is often used in discussions about gender identity and is in contrast to "transgender," which refers to individuals whose gender identity differs from their assigned sex at birth.
The term "cisgender" combines the prefix "cis-", derived from the Latin "cis," meaning "on this side of," with "gender." The use of "cis" in this context emerged from the need to have a term that describes individuals whose gender identity aligns with their assigned sex, thereby complementing the term "transgender."