A more thorough explanation:

Transgender is a term used for people who feel that their gender identity is different from the sex they were assigned at birth. For example, a transgender woman is someone who was assigned male at birth but identifies as female. Similarly, a transgender man is someone who was assigned female at birth but identifies as male. Some people who are transgender do not identify as male or female, or they may identify as a combination of both.

It's important to note that being transgender is not the same as being gay or lesbian. Gender identity is about who you are, while sexual orientation is about who you are attracted to.

For example, a transgender woman who is attracted to men would identify as a straight woman, while a transgender man who is attracted to women would identify as a straight man.

The opposite of transgender is cisgender, which describes people whose gender identity matches the sex they were assigned at birth.

Some examples of terms that people who do not identify as male or female use to describe their gender identity include androgynous, non-binary, or genderqueer.

These examples illustrate the definition of transgender by showing that gender identity is not always the same as the sex assigned at birth, and that there are many different ways that people can identify their gender.