I’m not QT, but I guess I’ll try to answer. I feel like in real life “a woman is some who says they are a woman” is like the best QT definition because if you question whether someone is a woman beyond that you are considered transphobic. Other definitions would be “someone with a female gender identity”, “someone with who identifies with femininity” or “someone with a female body map”. I feel like they all have problems. This question has been asked a like a million times on the Reddit sub and there is never one that fully makes sense that QT wouldn’t think was exclusionary.