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The individual identification of a person's gender, as defined by that person. Usually used in reference to transgender, genderqueer, or transsexual people -- people whose gender identities differ from their physical sex.
Jack is cisgender, and his gender identity is male. He's got a penis and XY chromosomes.

Jay has been really confused about her gender identity lately; she thinks maybe she's an androgyne, but she's not certain.

Jane is a transsexual woman, so her gender identity is pretty solidly feminine.
by Quil | April 22, 2007
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One’s internal sense of being male, female, neither of these, both, or other gender(s). This is separate from the sex one was assigned at birth, and can be different from one’s gender expression.
Person 1: “There are only 2 genders - penis & vagina!”
Person 2: “Actually, there are a lot more than two, and gender identity isn’t determined by physical attributes like genitals. *Tries to explain how they’re incorrect*”
Person 1: “There are still only 2 genders!”
Person 2: *Facepalms*
by HERO_DREAMER February 13, 2018
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The schizophrenic belief that you are anything but a man, woman, or hermaphrodite; despite being a man or woman on a biological and physical level.

Usually proclaimed by 3rd-wave feminists in order to get more attention or make themselves feel special. Be especially careful of saying "sir" or "ma'am" in California, New York, or Illinois. You might get arrested or fined.
"Gender identity includes 63 official genders that you can switch between every day."
via giphy
by Diarrhea Bubble Bath September 15, 2016
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