Cisgender: Describes a person whose gender identity aligns in a traditional sense with the sex assigned to them at birth.
Gender diverse: An umbrella term describing individuals with gender identities and/or expressions that vary from expected developmental norms. This includes people who identify as multiple genders or with no gender at all.
Gender dysphoria: A concept designated in the DSM-5 as clinically significant distress or impairment related to a strong desire to be of another gender, which may include desire to change primary and/or secondary sex characteristics. Not all transgender or gender diverse people experience dysphoria.
Gender expression: The outward manifestation of a person’s gender, which may or may not reflect their inner gender identity based on traditional expectations. Gender expression incorporates how a person carries themselves, their dress, accessories, grooming, voice/speech patterns and conversational mannerisms, and physical characteristics.
Gender identity: A person’s inner sense of being a girl/woman, boy/man, some combination of both, or something else, including having no gender at all. This may or may not correspond to the gender assigned at birth.
Nonbinary: A term used by some individuals whose gender identity is neither girl/woman nor boy/man.
Sex/gender assigned at birth: Traditional designation of a person as “female,” “male,” or “intersex” based on anatomy (external genitalia and/ or internal reproductive organs) and/or biology (sex chromosomes and/or hormones). “Sex” and “gender” are often used interchangeably, but they are distinct entities. It is best to distinguish between sex, gender identity, and gender expression and to avoid making assumptions about a person regarding one of these characteristics based on knowledge of the others. This is sometimes abbreviated as AFAB (assigned female at birth) or AMAB (assigned male at birth).
Sexual orientation: Describes the types of individuals toward whom a person has emotional, physical, and/or romantic attachments.
Transgender: An umbrella term describing individuals whose gender identity does not align in a traditional sense with the gender they were assigned at birth. It may also be used to refer to a person whose gender identity is binary and not traditionally associated with that assigned at birth.
Reference provided by the American Psychiatric Association
Perzanowski, E. S., Ferraiolo, T., & Keuroghlian, A. S. (2020). Overview and Terminology. In Forcier, M., VanSchalkwyk, G., & Turban, J.L. (Eds.), Pediatric Gender Identity: Gender-affirming Care for Transgender & Gender Diverse Youth (pp. 1-13). Springer Nature.