Cisgender

The prefix is Latin. Cis- means on this side of and trans- means across, a pairing borrowed from chemistry and from Roman geography, where Cisalpine Gaul sat on the Italian side of the Alps and Transalpine Gaul beyond them. The two halves are locational, not evaluative: neither side of the mountain is the normal one.

Why the word had to be invented

Before 1994 there was no ordinary English word for not being transgender. The absence was not neutral. Writing that contrasts transgender women with women has already decided which group is the real one, and the missing term made that framing almost unavoidable. Naming the default is what lets a sentence describe two groups instead of a group and an exception.

The word entered general dictionaries in 2015, two decades after it was coined, which is unusually fast for an academic term and reflects how quickly the surrounding discussion moved. Cissexual is an older variant with a narrower sense and is now rare.

What it does not mean

Cisgender says nothing about sexuality, presentation or conformity. A cisgender man may be effeminate, may be gay, may wear whatever he likes, and remains cisgender: the term reports one fact, which is whether his gender identity matches his birth assignment. It is also not a synonym for normal, and treating it as an insult mistakes a locational prefix for a judgement.

An intersex person may be cisgender. Someone assigned female at birth who is intersex and identifies as a woman is cisgender in the ordinary sense, though some intersex people find the trans and cis framing a poor fit for their experience and use ipsogender instead. Intersex covers that distinction.

What is actually measured

Nobody surveys cisgender people directly. The figure is a residual, whatever is left after the transgender estimate, which the Williams Institute put at 1.0 per cent of the United States population aged 13 and over in 2025. That makes the cisgender share roughly 99 per cent, with the usual caveats about people who decline to answer and about how the question is worded.

Why the residual is not a simple subtraction

Treating everyone who is not transgender as cisgender is the ordinary shorthand and it hides two groups. People who decline to answer a gender identity question are not evenly distributed, and surveys that offer only two options collect a cisgender answer from people who would have chosen a third had it been there. The Office for National Statistics found exactly this in the England and Wales census of 2021, where the wording of the gender identity question was challenged afterwards on the grounds that it had been misread by respondents with poor English.

The practical effect is small at population scale and large at the margins, and it is the reason this catalogue reports the cisgender share as a residual rather than as a measurement.

Who does not fit the pair

The cis and trans framing assumes a birth assignment that was straightforward to make. For intersex people it often was not, and some use ipsogender instead, meaning an intersex person who identifies with the sex they were assigned. That word exists because the binary of cis and trans was built without intersex bodies in view, not because anybody wanted a third option for its own sake.