Here's a definition of gender identity from The PFLAG National Glossary of Terms.
Gender identity: One's deeply held core sense of being male, female, some of both, or neither. One's gender identity does not always correspond to biological sex. Awareness of gender identity is usually experienced as early as 18 months old and reinforced in adolescence.
Gender identity is not a binary concept; it's not either/or. Instead, one's gender identity flows along a spectrum of possibilities. And it can change, be fluid. The resources in the other tabs on this page go into more depth about this topic.
Figure 1. Gender unicorn. Reprinted from "The gender unicorn," illustrations by A. Moore, design by L. Pan, n.d., retrieved from http://www.transstudent.org/gender. Copyright 2016 by Trans Student Educational Resources.
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Additional information from Trans Student Educational Resources to explain the five areas:
These resources provide additional information about gender identity.
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