Final answer:
Gender identity is the deeply held internal perception of one's gender. It refers to how individuals perceive themselves and is separate from biological sex, societal gender roles, and sexual orientation.
Step-by-step explanation:
The term for a person's deeply held internal perception of his or her gender is known as gender identity. Gender identity refers to one's internal, personal sense of being male, female, both, neither, or another gender entirely. This can align with or differ from the sex assigned at birth. In contrast, the terms "masculine" and "feminine" often address a person's gender, which denotes social and cultural characteristics typically associated with one gender or the other. Gender identity and expression are unique to each individual and may not necessarily conform to societal norms or genetic determinants.