Cisgender is a word that applies to the vast majority of people, describing a person who is not transgender. If a doctor announces, “It’s a girl!” in the delivery room based on the child’s body and that baby grows up to identify as a woman, that person is cisgender. Similarly, a baby designated male in the delivery room who grows up to identify as a man is cisgender. This is the case for about 99% of the population, at least according to the best available statistics.
Source: This Is What ‘Cisgender’ Means